Her car was heading south near the Thompsons Road intersection when it was hit by another car exiting from a car park.
She was taken to hospital following the crash, where she gave birth to a girl. The child died on Wednesday night.
The driver of the second car, a 31-year-old woman, was not injured in the crash.
Detective Acting Senior Sergeant Mark Patrick said a criminal investigation into the baby’s death was in its early stages, but police would speak to “an offender driver”.