An 18-year-old woman has been arrested after crashing her car and killing her 14-year-old sister, a moment she live streamed to her Instagram account.

Obdulia Sanchez, from Stockton, is accused of driving under the influence during the deadly incident in Los Banos, California on Friday.

Her younger sibling, Jacqueline Sanchez, died at the scene and authorities are now looking into the graphic video that they believe shows the deadly events unfolding.

The live Instagram footage shows Obdulia talking to the camera as she drives normally and the moment the car rolled over a barbed wire fence and onto a field.

Obdulia Sanchez, 18, is now detained in the Merced County Jail on charges of vehicular manslaughter while under the influence and DUI

The driver filmed herself singing and gesturing to the camera before the deadly crash

Gory visuals from the scene then show Jacqueline's body strewn on the floor, the other girl in the car waving for help and Obdulia talking to the camera.

During the live recording Obdulia said: 'Jacqueline, please wake up. I f****** killed my sister, OK? I know I'm going to jail for life. I love my sister… this is the last thing I thought was going to happen to us.'

'I killed my sister, but I don't care. I killed my sister. I know I'm going to prison, but I don't care. I'm sorry baby. I'm a hold it down.'

The disturbing clip ends with her kneeling next to her dead sister and saying: 'Wake up baby, I'm f**king sorry baby, I did not mean to kill you sweetie.'

Merced County Sheriff Vern Warnke said Jacqueline was not wearing a seatbelt when the car crashed and rolled on Henry Miller Road at about 6.45pm on Friday.

The 14-year-old was thrown through the back window of the car, authorities said.

Another girl, who police have not named but confirmed she was a minor, was also not wearing a seatbelt and suffered major leg injuries in the crash.

'I killed my sister.' Obdulia speaks directly to the camera before the crash, with a passenger visible in the background, left, and, right, keeps filming after the crash

The car rolled over a barbed wire fence and onto a field in Los Banos, about 120 miles southeast of San Francisco, on Friday

Authorities say Obdulia was detained at the scene after allegedly becoming combative with officers after the crash. She was screaming that her sister was dead as officers tried to calm her down and lead her into an ambulance (above)

The California Highway Patrol said Obdulia was driving the car when it veered onto the right shoulder of a road about 120 miles southeast of San Francisco.

She over-corrected, causing the vehicle to swerve across lanes, crash through a wire fence and overturn into a field.

Obdulia was wearing a seatbelt and suffered minor injuries.

She is now in the Merced County Jail on charges of vehicular manslaughter while under the influence and DUI.

Authorities say she was detained at the scene after allegedly becoming combative with officers after the crash. She was screaming that her sister was dead as officers tried to calm her down and lead her into an ambulance, the Fresno Bee reports.

Obdulia complained of pains in her chest and knee after the crash.

Police told ABC 30: 'Sanchez was under the influence when she rolled her car over, into a barbed wire fence and then a field.'

Obdulia has more than 7,400 followers on Facebook and Instagram. It is not clear if her Instagram profile photo (right) shows her injuries from the recent deadly crash

Authorities say 14-year-old Jacqueline Sanchez, pictured above, died at the scene

Authorities say they were made aware of the shocking crash scene video circulating on social media and were working to determine if it was authentic.

Family members have confirmed the video was shot by Obdulia.

They say the victim, Jacqueline, was supposed to celebrate her Quinceanera (15th birthday) on Sunday.

Mary Hernandez, of Stockton, who viewed the live stream, decided to record it while unsure if the shocking footage was real.

'At first we didn't even want to believe it was real,' she said.

'I recorded it and posted it mainly because as someone who uses Snapchat I see a lot of people driving with their Snapchats doing what she was doing, so to me it was like an eye opener.'

The footage received at least 700,000 views.

Family members have started a GoFundMe Page for Jacqueline's funeral expenses.

Facebook has been repeatedly accused of failing to remove graphic and unsuitable content. In April it announced it was hiring 3,000 more staff to monitor posts.