A woman who family said had showed signs of depression deliberately crashed her vehicle into Michigan's Kalamazoo River, killing herself and her nine-year-old twin daughters, on her grandson's birthday.

Kalamazoo police said they had found the body of Ineza McClinton, 44, and one of her daughters inside the submerged vehicle in the river on Monday and found the other daughter's body on Tuesday, in what is being investigated as an apparent murder-suicide.

Ineza's older daughter, Tishyron McClinton, said her mom 'didn't seem like herself,' but she never suspected she would take her own life, or those of her Tishyron's sisters, Faith and Angel.

'She was having some difficulties in her life. She was talking about how she was tired, sad and lonely,' Tishyron said. 'Never in a million years would I thought she had a plot or a plan.'

Ineza McClinton, 44 (center), who family said had showed signs of depression, is believed to have intentionally drove her car into Michigan's Kalamazoo River, killing herself and her twin, nine-year-old daughters, Faith and Angel (left and right)

Ineza's other daughter, Timasha McClinton, was equally surprised, sharing on Facebook, 'I lost my mother and my sisters on my son birthday. I talked to my mother an hour before this happen... no sign. She was around two of her older children that day and didn’t show any sign.'

There were four children believed to have initially been in the car with Ineza, but police told DailyMail.com that two children, who family identified as her grandchildren, had been dropped off before the car was driven into the river.

The girls, both under the age of 10, alerted police but it was too late.

Ineza's lder daughter, Timasha McClinton (left), was surprised at the apparent murder-suicide, sharing on Facebook, 'I lost my mother and my sisters on my son birthday. I talked to my mother an hour before this happen... no sign. She was around two of her older children that day and didn’t show any sign'

Faith and Angel McClinton are pictured in a photo shared to social media

Ineza's older daughter, Tishyron McClinton (pictured), said her mom 'didn't seem like herself' and had showed signs of depression but she never suspected she would take her own life, or those of her twin sisters

Ineza, who was a mother of six, apparently tried to share something of importance with Tishyron before it's believed she took her own life, but couldn't quite get it out.

'Her last words -- she was trying to tell me something. She told me she had something to tell me, but when I asked her what it was, she couldn't really get it out,' Tishyron told KRON 4.

In a separate interview with WWMT, Tishyron added, 'I want my mom back, I want my sisters back. It's a very hard pill to swallow.'

Ineza's sister, Jeanette, said both Ineza and her daughters, Faith and Angel, had glowing personalities.

'They did not deserve this. So smart and beautiful, charming -- oh I love them, I miss them so much,' Jeanette said. 'I don't know why she didn't reach out and talk to us.'

Ineza is said to have also had her two granddaughters, both under age 10, in the car with her before the crash, but they had been dropped off at a nearby Walgreen's. Family and loved ones of Ineza are shown at the scene of the crash

Authorities responded to a call of two girls being upset at the Walgreen's drug store at around 10.45pm on Monday, and when they arrived, the girls told them about them about the crash. The vehicle recovered in the river is shown

Police are trying to figure out why Ineza dropped off her granddaughters, but took her daughters Faith and Angel with her.

Ineza's daughter, Timasha, had a guess about what may have been her reasoning behind that choice.

'Do I agree with what she did HELL NO!! BUT AT THE END OF THE DAY IT WAS HER CHOICE,' she wrote on Facebook. 'My sisters have never been without my mom. She took them with her because she was protecting them in her mind. So for her taking them with her was the only option.'

That kind of thinking is commonly associated with the most severe cases of postpartum psychosis, where women may find themselves in an alternate reality where they truly believe the most loving thing they can do for their children is kill them, according to a study published in Current Psychiatry.

Ineza's youngest children, however, were the nine-year-old twins who died with her, placing her well beyond the recognized postpartum period of within one month of delivery, as outlined by Diagnostic and Statistical Manual of Mental Disorders (though experts acknowledge the time frame is probably far wider than that).

For whatever reason, Ineza left her granddaugthers behind, and authorities responded to a call of the two girls being upset at the Walgreen's drug store where they were dropped off at around 10.45pm on Monday.

Upon arriving at the store, authorities worked with the young children to determine where to search for Ineza, Faith and Angel.

Authorities then responded to the area of Verburg Park off from Paterson Street with a boat.

Authorities responded to the area of Verburg Park off from Paterson Street (shown) with a boat and found the vehicle submerged with the body's of Ineza and one child inside. The second child's body was found on Tuesday

The boat used to recover the car at the scene of the crash is shown

'Within a few minutes of being in the water, officers located a submerged vehicle. A few minutes later, two victims were located,' the Kalamazoo Department of Public Safety said in a statement on Tuesday.

Police later pulled the third body, one of the daughters, from the river.

The girls told police they were looking for their uncle, who they found soon after meeting with police.

Authorities said the uncle was not believed to have been involved with the tragedy.

In her Facebook post, Timasha called for people to be respectful with their comments about her mother's death.

Police are trying to figure out why Ineza dropped off her granddaughters, but took her daughters Faith and Angel (left and right) with her. Ineza's daughter, Timasha (center), had a guess about what may have been her reasoning behind that choice

'Do I agree with what she did HELL NO!! BUT AT THE END OF THE DAY IT WAS HER CHOICE,' Timasha wrote on Facebook. 'My sisters have never been without my mom. She took them with her because she was protecting them in her mind. So for her taking them with her was the only option.' In her Facebook post, Timasha called for people to be respectful with their comments about her mother's death

'People are so f**king cruel,' she wrote. 'Y’all don’t know my mother personally, y’all don’t know her struggles , For y’all this is just news But for us this is our life, our mother, our siblings We have to live this.

Timasha shared that her mother had not had an easy life, giving birth to three children as a teenager.

'My mother had three kids before the age of 14 she wasn’t protected. Life didn’t deal her a good hand, and it became too much for her,' Timasha wrote.

'Do you know how lost, how feed-up , how hopeless a person have to feel for them to do what she had done? No you don’t. You don’t have to understand it, you don’t have to like it. But please be mindful of how you treat other and the things you say. We (her children/ grandchildren ) and family member see your hurtful and disrespectful comment. We are all sinners so who are you to judge?'

Police are shown at the scene, with the vehicle Ineza was driving behind them, showing damage above the front, driver side wheel

The vehicle was recovered with the help of a state police dive team. A diver is shown

The vehicle was recovered with the help of a state police dive team.

Anyone with information is asked to contact Kalamazoo Public Safety at 269-488-8911 or Silent Observer at 269-343-2100 or go to kalamazoosilentobserver.com.

For confidential support in the US, call the National Suicide Prevention Lifeline at 1-800-273-8255 or click here.

For confidential support on suicide matters in the UK, call the Samaritans on 08457 90 90 90, visit a local Samaritans branch or click here.

For confidential support in Australia, please call Lifeline on 13 11 14 or click here.