Adelaide mum Kylie Anne Hie has admitted to being high on methamphetamines when she crashed her car and killed her four-year-old daughter.

The pair, who were driving home from a funeral in November 2013, were travelling in Hie’s white Toyota van when the 34-year-old attempted to overtake a 40 tonne semi-trailer on the South Eastern Freeway.

Within moments, the two vehicles had collided, with Hie’s daughter, Charlotte May-Grace, dying at the Women’s and Children’s Hospital shortly after the crash.

Hie's vehicle following the crash in 2013. Source: Channel 9 News. 

Police have claimed Charlotte was sitting in a car seat that had not been properly restrained in the front passenger seat at the time of the crash.

Despite testing positive for methamphetamine following the accident, Hie had long denied being under the influence of drugs, claiming she had suffered a seizure at the time of the accident instead.

Kylie Anne Hie with Charlotte as a baby. Source: The Advertiser / Channel 9 News. 

Hie appeared at the Adelaide District Court on Wednesday, pleading guilty to aggravated death by dangerous driving. According to The Advertiser, the change in pleas comes following Hie visiting the crash site with jurors this week.

Prosecutor Carmen Matteo told the courtroom that Hie had been seen driving erratically and tailgated a number of other drivers in the lead-up to the crash, noting that Hie had previously been convicted of drink-driving, speeding, and driving on a disqualified licence.

Hie appearing in court on Wednesday. Post continues... 

Hie's attorney, Heather Stokes, said it has "obviously been very difficult for my client for a very long time."

The 34-year-old was granted bail and ordered to return to court in October for her sentencing.

*Main image via Facebook.