The Illawarra woman and the bill's founder, Brodie Donegan, have joined forces, uniting to again present the bill next session if it isn't debated in Parliament this year.

The bill, introduced after Ms Donegan's unborn daughter was killed by a drug-addled driver in 2009, aims to create a new offence of grievous bodily harm to a foetus.

Despite passing the lower house in November last year, the bill has languished in the upper house ever since.

If it is not introduced by the end of this week - Parliament's last sitting week of the year - it will lapse without being voted on.

Ms Sparks, whose unborn daughter, Mia, was killed by drugged driver Marco Silvestri in Dapto last year, believes the government has simply put the bill in the "too hard basket".

"I think when something stirs any opposition it tends to sit in the too-hard basket," she said.

"But something like this is too important to remain there without being properly addressed.

"We don't need to wait for another incident for this to be looked at again."

Ms Sparks and Ms Donegan are pushing ahead with their campaign, meeting with MP Greg Donnelly to redraft the bill.

"Our children's lives are too important for this bill to be ignored," Ms Sparks said.

"Any expectant mother, father, grandmother - any person needs to really understand what this bill is trying to protect: our future. Our children are our future and if their lives are taken away criminally and that is not recognised or protected, then what hope does our world have?"