Toddler Ayeeshia resembled a "car cash victim" when she died.

When 21-month-old Ayeeshia Jane Smith died, pathologists said her body resembled a “car crash victim”.

It was a stomp from her mother, Kathryn Smith, which is believed to have torn her heart in a way usually seen in people who’ve fallen from buildings or had car accidents, the BBC reports.

Smith, 23, was convicted of murder and cruelty in a Birmingham court on Friday after a six week trial and now faces the prospect of life in prison.

Her partner Matthew Rigby was cleared of murder, but convicted of causing or allowing a child’s death.

The chilling call Smith made to emergency services on the day of Ayeeshia’s death:

The court heard horrific accounts of the toddler’s ongoing abuse, including that she had been heard screaming “stop mummy, stop daddy” just days before death.

Ayeeshia had 16 separate injuries when she was examined after her death, including historic bleeding on her brain, which may have been caused by shaking.

Prosecutor Christopher Hotten described “a consistent pattern of non-accidental bruising”, which could have been inflicted by Rigby or Smith, but must have been known about by both.

“No child, certainly under the age of two, should suffer bruising at the hands of those who should be caring for her,” he said.

“However, that is precisely what we say happened to Ayeeshia in the eight months or so these two people were jointly looking after her.

Ayeeshia’s biological father, Ricky Booth, also appeared in court and said he felt “let down by the system”, which failed to protect her.

He said he contacted social services on several occasions regarding unusual marks found on her body and even gave photos to social workers.

In June 2013, just 11 months before her death, Ayeeshia was placed with a foster family, but was inexplicably sent back to her mother just months later. An urgent inquiry is trying to uncover why.

Ayeeshia with her mother and father on her first birthday. Image: Facebook

Booth described Smith's actions as "pure evil" and said no punishment would be "good enough" for his ex.

"Nothing will bring AJ back and I will always be left with the guilt that I wasn't able to protect her," he said in his court statement.

"I now wish my daughter had been placed in permanent care as she may well have been alive and still with us now."

A former friend said Smith had deliberately conned authorities into thinking she was a doting mother, despite spending her benefits on marijuana and often ignoring her daughter's cries when she was high.

"The house was clean and tidy, so if the authorities came round it looked like a nice home," the friend told the Sun anonymously.

"But she wasn’t a loving parent. She treated Ayeeshia like crap. It was like she was an inconvenience.

"One time she said to me, 'Do you want to buy her? I could do with some cash for weed.' What parent says that about their child? I wouldn’t have put it past her."