The 86-year-old woman who was behind the wheel of a car that allegedly struck and killed six-year-old Indie Armstrong was too unwell in hospital to face court on Queensland's Sunshine Coast this morning.

A silver hatchback hit Indie, her eight-year-old sister Lily, their mother Emily and grandmother Sandy Bampton as they stood at a pedestrian crossing in front of the Coles Supermarket at Nambour on June 17.

Emily Armstrong and her daughters Indie (L) and Lily were hit by the reversing car. ( Facebook: Emily Armstrong )

Miriam Grace Paton is charged with dangerous operation of a motor vehicle causing death over the crash, which also injured Lily and Ms Bampton.

Ms Bampton remains in hospital at Kawana.

Mrs Paton's lawyer Peter Boyce told the court she was in hospital and would likely need treatment for another two weeks.

Magistrate John Parker referred to a medical certificate provided to the court.

"She's clearly very unwell and I can understand why," he said.

Documents submitted to the court show Mrs Paton is suffering a spinal injury that is stopping her from walking.

She has now developed pneumonia while in hospital.

Mr Parker said he would "excuse her appearance" and give her bail on her own undertaking.

Mrs Paton is due to face court again on September 21.

If found guilty, she faces a maximum penalty of 10 years in prison unless speed, alcohol or drugs are found to be factors.

Indie's death has prompted an enormous outpouring of support for the Armstrong family.

More than $80,000 has been donated by the community to a 'Support the Armstrongs' online fundraiser.

Thousands more has been raised by charity cricket matches, bake sales and school events.