The anguished mom of missing student Mollie Tibbetts has revealed perplexing new clues about her daughter's mysterious disappearance two weeks ago - telling DailyMail.com: 'I'm in purgatory.'

University of Iowa sophomore Mollie, 20, was last seen on the evening of July 18 when she went jogging in her rural hometown of Brooklyn.

In the past two weeks investigators have completed 200 interviews, fielded hundreds of tips and carried out painstaking fingertip searches of the vast cornfields surrounding the close-knit farming community, an hour east of De Moines.

But without a single credible lead pointing to her daughter's whereabouts, Laura Calderwood, 54, added: 'I'm either going to be headed up to heaven or down to hell, depending on the result.'

Psychology major Mollie was dog-sitting at the home of her construction worker boyfriend Dalton Jack, 20, when she set off for her evening run around 7.30pm.

He says his last contact with his girlfriend of three years was a Snapchat message he opened at around 10pm.

Still missing: Mollie Tibbetts, 20, was dog-sitting at her boyfriend Dalton Jack's home in Brooklyn, Iowa on July 18 when she went for a jog and vanished

A mother's anguish: Mollie's mom Laura Calderwood, 54, told DailyMail.com that her daughter's disappearance has left her 'in purgatory'

Mollie was last seen jogging on West Pershing Drive by a neighbor around 7.30pm on July 18. Her boyfriend, who was staying 120 miles away in Dubuque, opened a Snapchat from her at 10pm

The next morning Mollie failed to show up to work at Grinnell Regional Medical Center located 15 miles from her home. Her family then reported her missing to police

Jack thinks it was taken indoors at his house but told DailyMail.com he couldn't be sure because the message expired ten seconds later.

DailyMail.com understands that the tech giant Snap Inc. may not be able to retrieve the content of the 'snap' because it wasn't saved.

Investigators do, however, have access to data from the Fitbit device that high school cross country competitor Mollie used to monitor her runs.

The fitness accessory is one of a number of items search teams are still desperate to find, including Mollie's clothing, her gold colored iPhone7, earbuds and an armband.

Her car, a wallet containing a driving license and debit card, and an unused passport, have all been located, according to Laura - who says it's 'inconceivable' her daughter skipped town without saying a word.

Investigators are so far refusing to say whether or not Mollie made it home from her jog, with conflicting evidence suggesting she may have gone missing later that night or even the next morning.

When she failed to show up her at her summer job at a daycare center on July 19, friends and family raised the alarm.

And despite nationwide media coverage there have been no arrests nor confirmed sightings to date.

'Every time I try and form an opinion there is a piece there that doesn't fit into the puzzle,' a confounded Laura told DailyMail.com.

Laura (pictured with young Mollie and her brother Jake) says it's 'inconceivable' that Mollie skipped town without telling anyone and has 'braced herself' for the possibility that she was abducted

Authorities have not named any suspects in the case so far, despite conducting more than 200 interviews

She admitted she has 'braced herself' for the possibility Mollie was abducted – but added: 'My faith is strong and the conviction to find Mollie gets a little bit stronger every day.

'The focus is on finding her. Everyone is working together to get her back safely.'

Mollie is 5ft 3in tall, weighs about 120 lbs and has long brown hair and brown eyes.

Anyone with information about her is urged to contact the Poweshiek County Sheriff's Office at 641 623 5679 or email tips@poweshiekcosheriff.com

Tips can also be submitted via Crime Stoppers of Central Iowa which has collected $172,000 so far in donations that will be available as a reward for information leading to Mollie's safe return.

Crime Stoppers can be contacted anonymously at 1-800-452-1111 or via their website.

LACK OF SUSPECTS

Mollie was staying overnight at the home of her boyfriend Dalton Jack but he was 120 miles away in Dubuque, Iowa working for a construction firm.

Investigators say they have ruled Jack out as a suspect and Laura Calderwood insists he's above suspicion.

'He's a good guy. They were devoted to one another,' she told DailyMail.com.

Jack lives with his 23-year-old brother Blake Jack and Blake's fiancée, Allie Houghton, 24, who were also out of town.

Tibbetts had been staying at her boyfriend Dalton Jack's (pictured) home in Brooklyn while he was working a construction job 120 miles away. He said he received a Snapchat from her that night

This is the home where Mollie was last thought to have been when she went missing. Brooklyn residents typically do not lock their doors, but her mother does not believe she returned to the home after her jog

Police photographed the inside of Wayne Cheney's home, took his cell phone overnight and took him away from the property to be questioned

Mollie's mom is estranged from her father, Robert Tibbetts, 59, who lives in Oakland, California and flew into Iowa after she vanished to help search for her.

With family and friends in the clear, investigators looked at registered sex offenders and convicted criminals living locally.

Wayne Cheney, 56, lives in a trailer home about 500 yards from a pig farm that was searched by investigators eight days ago.

Wayne Cheney, a man with stalking convictions in 2009 and 2014, lives in a trailer home about 500 yards from a pig farm that was searched by investigators eight days ago.

The 56-year-old told DailyMail.com he sold the facility to Prestage Farms five or six years ago.

He said he had never met Mollie or her family.

When asked about his previous arrests, he said: 'I was arrested in 2011 for breaching a restraining order. It was an ex girlfriend. That was the only time.'

Cheney then terminated the interview abruptly and went back inside his one-story, trailer home in Deep River, 15 miles south of Brooklyn.

Calls to Prestage Farms were not immediately returned.

The search yielded nothing and Cheney told the TV station he didn't know Mollie or her family but hoped she would be tracked down soon.

Police in Dubuque meanwhile quizzed a suspect in an assault on a female jogger on Sunday while another man was questioned in Pella, an hour from Brooklyn, after he was spotted taking covert photos of girls.

However, neither individual has been linked to the hunt for Mollie and cops say they are yet to identify a suspect.

Authorities have also said a reported sighting of Mollie at a truck stop in the Kansas City, Missouri area late last month, was not her.

THE FITBIT FOOTPRINT

One of the key questions for investigators is establishing the route Mollie took on her run and whether she ever returned home.

Laura Calderwood said her daughter ran for about 45 minutes every evening, varying her route through the town's pretty rural trails and cornfields.

Almost every store and vehicle across the Iowa town of 1,413 people is adorned with the now-recognizable photo of a carefree, smiling Mollie, along with a plea for information

The Live Now printing store is relying on scores of volunteers just to keep up with the demand for buttons, magnets and posters. Pictured above is graphic designer April Kane

She left Dalton Jack's four-bedroom home in West Des Moines Street and was last seen by a neighbor, Nate Hopwood, who lives a few hundred yards away in West Pershing Drive. From there the trail goes cold.

The FBI has gained access to Mollie's Fitbit which typically tracks the number of steps a user has walked, their heart rate, quality of sleep, steps climbed and other fitness metrics.

If she had a more advanced model that hooked up wirelessly to her phone's GPS it's possible they could glean the exact route.

Authorities have said they are tapping into all the electronic tools at their disposal to access data on Mollie's phone, social media accounts and email.

'I know they have subpoenaed Google to gain access to three different email accounts she used,' Calderwood told DailyMail.com.

SNAPCHAT COULD BE LOST FOREVER

Dalton Jack glanced at his Snapchat account at 10pm on July 18 and noticed a 'Snap' from Mollie.

He remembers seeing her face and a brief caption along the bottom of the screen - but says he can't recall what it said.

Jack told DailyMail.com he thinks it was taken indoors at his home but admits he cannot recall any particular identifying features in the background.

Mollie's boyfriend (pictured right) says he received a Snap from her at 10pm that night, but can't recall what it said

And while the message was opened at 10pm - two and a half hours after Mollie set off on her run - there is no way to tell when it was sent.

Crucially, Jack didn't save the message to 'Memories' which means it cannot be accessed again because 'Snaps' self-delete after ten seconds.

'I think it was my house but I can't be certain, I guess,' he said. 'I don't know the significance of it but hopefully the authorities can figure out what's important and what isn't.'

DailyMail.com understands there is a chance that Snap Inc. may never be able to retrieve it from the electronic ether.

The tech giant says in its guidance for law enforcement that in 'certain limited circumstances it may be possible to retrieve the content of sent Snaps'.

This can happen without a user's consent if there is a 'threat of imminent death or bodily injury'.

However the company warns: 'The reason we often will not be able to retrieve Snap content is that we delete each snap from our servers once all recipients have viewed it.'

Laura Calderwood called on Snap Inc. to do everything possible to find her daughter's final message and establish when it was sent.

'In my opinion virtually everything electronic can be retrieved,' she told us. 'It's not like they throw the Snapchats into the water and they float down the stream.'

Snap Inc. did not respond to a request for comment.

THE MISSING ITEMS

Mollie's mom told DailyMail.com that all the items and clothes she took on her run have never been located.

These include her Fitbit, a gold-colored iPhone 7s in a protective case, some white earbuds and an armband pouch she used to hold the handset while she ran.

Her dark colored running shorts, pink sports top and running shoes are also yet to be found despite extensive searches of Brooklyn and the surrounding county.

Mollie would often walk from Dalton Jack's place back to her mom's house in Bear Drive to eat with her brothers Scott, 17 and Jake, 21.

This is the Silver Pontiac G6 Mollie shared with her brother Jake and would drive to work. She failed to reply to her brother's text on July 19 when he asked if she need a ride

She shares a Silver Pontiac G6 with Jake that she would usually use each morning for the 15-mile journey to her job at the Grinnell Regional Medical Center in Grinnell, Iowa.

But on the morning of July 19 she didn’t turn up at the family home and failed to reply when Jake texted to ask if she needed a ride.

Laura said her daughter's laptop and wallet, containing her driving license and debit card, as well as the newly acquired passport, have been located. The Pontiac is still parked on Laura's driveway, now with a 'Missing Mollie Tibbetts' poster attached to the trunk.

RED SHIRT OR RED HERRING?

The reported discovery of a red shirt in a roadside ditch Thursday ignited fevered speculation it could belong to Mollie, who wore a similar t-shirt each day to her job at the medical center.

It was reported that a red t-shirt linked to Mollie's job had been found, but her mom says her daughter owned two of those shirts and they are both in her room

In theory, she could made it home from her jog, slept at her boyfriend’s house, changed for work then gone missing the next morning while wearing the red item.

The clothing was spotted by someone out mowing grass but Kevin Winkler of the Iowa Department of Public Safety told a press conference Friday he had ‘no information’ to confirm that anything belonging to Mollie had been found.

Laura Calderwood told DailyMail.com that she had found two of her daughter’s red work shirts in her bedroom but could not be certain there wasn’t a third somewhere.

Mollie sometimes changed for work at her mom’s house before taking the Pontiac but also kept clothes and possessions at Dalton Jack’s house.

'She sort of lived across both houses, she had her stuff in both places,' he told DailyMail.com.

Jack said Mollie would sometimes borrow his truck, a Dodge Ram 1500, and head straight to work without stopping in at her mom’s place.

But that wasn’t possible on July 18-19 because he had it with him in Dubuque, where he was working for Jasper Construction Services.

DOGS IN THE BASEMENT AND A PAPER ON ANCIENT ROME

Like a lot of the folk in Brooklyn, Mollie didn't typically lock her doors at night, according to her boyfriend Dalton Jack.

However one of the reasons she was seemingly relaxed about her safety was the presence of their two large dogs, a pitbull-Labrador mix and a boxer mix.

These are two dogs - a boxer mix and a pitbull-Labrador mix - that Mollie was watching while her boyfriend, and her boyfriend's brother Blake and fiancee (pictured) were out of town. Both dogs were found in the basement suggesting Mollie did not return to the house to let them out

The two animals were locked in the basement when everyone was out but roamed freely when people came home.

'If she was at home with the dogs, she would have let them out the moment she got in,' Calderwood revealed. 'If she slept at the house that night they would have been on the bed with her.'

Jack told DailyMail.com that when he found out Mollie was missing and raced home on July 19 he found the dogs in the basement.

There was no sign that either of them had fought with an intruder or had been distressed or agitated.

'If someone was coming for Mollie, one of the dogs, the lab-pit mix which is the bigger of the two, would probably have done something about it,' he said.

In a further intriguing clue, investigators are believed to have found evidence Mollie had been using her MacBook Pro laptop on the evening of July 18.

Calderwood said that a look at the internet history after it was retrieved from Jack's house suggested Mollie had been working on a homework assignment for her Roman Civilization class.

However, she warned that it was unclear exactly when the laptop was used and cautioned against drawing any firm conclusions.

A TOWN MOBILIZED

Almost every store and vehicle across this town of 1,413 inhabitants is adorned with the now-recognizable photo of a carefree, smiling Mollie, along with a plea for information.

The same image appears on the more than 20,000 flyers distributed in the past two weeks and on the 800-plus t-shirts residents are wearing around Brooklyn, where legendary actor John Wayne lived as a boy.

The appeal's makeshift HQ, the Live Now printing store owned by Joy and Gabe Vanlandschoot, is relying on scores of volunteers just to keep up with the demand for buttons, magnets and posters.

'The town's priority is to bring Mollie home safe. That's what's on everyone's mind last thing at night and first thing in the morning,' graphic designer April Kane, 34, told DailyMail.com.

'Brooklyn is a small community and we help our own. She's a sweet, kindhearted girl and we all want her found.'

The appeal has gone statewide and beyond with billboards across Iowa and a Crime Stoppers reward fund that has now swelled to $172,000 thanks to public donations.

So many people joined last week's search parties that law enforcement had to appeal for everyone to go home because nobody was in when they canvassed door to door.

'People need to keep looking for her and doing everything they can,' added Mrs Vanlandschoot, 39. 'Mollie would never give up on looking for somebody else.'

A PROMISING FUTURE AND A POSSIBLE PROPOSAL

Popular, headstrong and independent, Mollie Tibbetts excelled at school, made friends wherever she went and had her whole future mapped out ahead of her, according to her mother.

About to enter her sophomore year at the University of Iowa, Mollie's dream of becoming a child psychiatrist was within touching distance.

She graduated from Brooklyn, Guernsey, and Malcom High School in 2017 where she ran track and competed on the debate team.

Mollie was about to enter her second year at the University of Iowa, where she was studying to become a child psychiatrist

Mollie's mother is estranged from her daughter's father, Rob Tibbetts (pictured) 59, who lives in Oakland, California and flew into Iowa after she vanished to help search for her

'The effect on her family, well it's been excruciating. As a person and as a daughter, Mollie was so caring and compassionate. She loved working with children,' said her mom, Laura Calderwood.

'Add brave to everything else,' Rob Tibbetts, who remarried in June, said in a TV interview.

Mollie's disappearance has also devastated her boyfriend Dalton Jack who told DailyMail.com he wanted to marry Mollie one day and raise a family with her.

The psychology major had applied for her first passport so she could fly out to the Dominican Republic to attend the wedding of Dalton's brother Blake Jack and Blake's fiancée, Allie Houghton, 24.

Dalton revealed how his brother had urged him to take advantage of the romantic setting to propose to Mollie.

'She was the marriage, kids, house, spending the rest of your life with one person deal for me, oh yeah,' he said.

'All the positives you've heard from everyone about her are true. How could you not love someone like that.'