Her baby boy was later delivered by doctors at the Royal Hobart Hospital, where he remains in intensive care.
It's believed Mr Stirling has remained at his baby's bedside since the crash.
The tragedy has tugged at the heartstrings of people across Australia, with a fundraising campaign set up on Friday night by Mr Stirling's employer already raising $117,850 by 3.30am on Sunday morning.
And that number is rapidly growing on the My Cause website.
MyState bank is also accepting cash donations on behalf of the family.
More than 150 people turned out for a candlelight vigil at the crash site in Hobart on Saturday night.
Four teenagers, aged between 12 and 15, have been charged in relation to the smash, with the 15-year-old alleged driver charged with manslaughter and stealing a car.