The 86-year-old woman driving the car that reversed into and killed a six-year-old girl in a carpark on the Sunshine Coast will be charged with dangerous driving causing death, the ABC has learned.

If found guilty, she faces a maximum penalty of three years in prison.

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

The driver was not injured.

Ms Armstrong and Lily were each released from Sunshine Coast University Hospital in the weeks that followed. Ms Bampton remains in the Royal Brisbane and Women's Hospital.

It is understood the driver was not suffering any medical condition at the time of the crash.

News of the looming charge comes days after friends and family filled a chapel on the Sunshine Coast for Indie's funeral service.

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

More than $79,000 has been donated by the community to the "Support the Armstrongs" fundraiser online.

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

The death of Indie also sparked a national debate over if and when elderly drivers ought to surrender their licences.

The Forensic Crash Unit has not confirmed the charges.