The elderly woman who hit and killed six-year-old Indie Armstrong has died.

An elderly driver who hit and killed Queensland girl Indie Armstrong has died after telling her husband she could not live with her sorrow.

Miriam Grace Paton, 86, died in hospital on Wednesday after a long period of illness that followed the six-year-old girl’s death in a Sunshine Coast car park in June.

Mrs Paton’s husband, Stuart, 90, said his wife, who was a primary teacher for half a century, had loved children and could not live with her sorrow.

Her last words to her husband were, “I’ve killed a child and I don’t want to live anymore,” a report in The Courier Mail says.

“She was heartbroken, she could not bear the thought of having caused the little girl’s death. She wanted to die,’’ Mr Paton said.

His wife had been facing a count of dangerous operation of a motor vehicle causing death for the tragic incident which occurred on Sunday June 17, but had been excused from her first appearance at the Maroochydore Magistrates Court due to ongoing ill health following the accident.

Mrs Paton had been a school teacher for 50 years, dedicating her life to helping children.

Indie was at Nambour shopping centre at around noon on the day of the accident with her mother, grandmother, and older sister Lily, when Mrs Patton allegedly reversed her car into her.

The Year 1 student was killed, and her 57-year-old grandmother and eight-year-old sister injured. A witness told the Courier Mail the driver “was going to stop but instead of stopping she accelerated and the car went like a bullet through the people on the pedestrian crossing."

The Courier Mail reports police, the court and the Armstrong family have been notified of Mrs Paton's death.

You can contribute to the GoFundMe campaign for the Armstrong family here. 

If this story has raised any issues for you, please seek professional help, or contact Lifeline on 13 11 14.

- With AAP.