The elderly woman who was behind the wheel of a car that struck and killed a six-year-old girl on the Sunshine Coast told her husband "I killed a child and I don't want to live anymore" before she died this week in hospital.

Former teacher Miriam Grace Paton, 86, reversed her silver hatchback over Indie Armstrong at a Nambour shopping centre car park on June 17.

Indie was standing at a pedestrian crossing with her eight-year-old sister, their mother Emily and grandmother Sandy Bampton when they were struck.

The eight-year-old and Ms Bampton were also injured in the incident.

Ms Paton was charged with dangerous operation of a motor vehicle causing death, but missed several court dates due to ill health.

She was admitted to hospital two days after the crash suffering a spinal injury and later developed pneumonia.

Her solicitor Peter Boyce said Ms Paton had been in hospital for most of the time since Indie's death.

"'I've killed a child and I don't want to live anymore' is what she said to her husband," Mr Boyce told the ABC.

"She made a decision she didn't want further treatment. They were tragic circumstances, she's spent almost all the time in hospital.

Children leave messages of love and support for Indie Armstrong's family at a makeshift memorial. ( ABC News: ABC Sunshine Coast Nicole Hegarty )

"The pain and anguish seen on her face when we talked briefly about this matter is something I'll never forget," Mr Boyce said.

"Miriam, as small and frail as she was, she decided there is no point in going on.

"Those words, 'I killed a child and I don't want to live anymore' were her words."

Paton went 'the extra yard to help children'

Ms Paton never had children of her own, but dedicated her life to teaching.

Ms Paton during her final year of work as a teacher in 1998. ( Supplied: Peter Boyce )

"She didn't just teach, she put in the extra yard to help children," Mr Boyce said.

"It's a tragic outcome, not only for Miriam and for her family, but for Indie's family who are still suffering and grieving."

He said Ms Paton's husband Stuart, 90, was "doing it tough".

"He is marvellous for his age and has been going to hospital all the time to be with her.

"We carry on, but he has lost his wife, he has lost his soulmate.

"But she wouldn't want her death to overshadow the fact of the remorse she felt."

Police at the scene of the accident. ( ABC Sunshine Coast: Nicole Hegarty )

Indie loved her family 'to the moon and back'

Indie's death was followed by an outpouring of grief from the Sunshine Coast community.

Hundreds of people filled a Sunshine Coast chapel in July to farewell the six-year-old at a funeral described as having "an atmosphere of love".

Mourners heard how Indie would tell her mother, father, grandparents, great-grandparents that she "loves them to the moon and back".

The service was told her parents, Jason and Emily, were left without Indie's morning and evening cuddles and now have an "Indie-shaped hole" in their lives.

A candlelight vigil was held for Indie, while tens of thousands of dollars were raised through a fundraising site for the Armstrong family.

Pastor Dale Dowler from the local Shack Community Centre said there were "hearts broken" across Nambour, but the support shown for the family showed the "heartbeat of the community".

The principal of Indie's North Arm State School Kelly Edgar said the community was "deeply shocked and saddened".

Premier Annastacia Palaszczuk at the time described the incident as an "absolute tragedy".