The twins were born prematurely with a condition known as congenital 'Long Segment Tracheal Stenosis'.
The condition prevents the girls from breathing properly as it causes major restrictions to the airway.
Audrey needs to raise the money within a week as she needs to prove to London's Great Ormond Street Hospital that the funding is in place to pay for the girls surgical procedures, which are booked for December 17th.
The twins' mother bumped into Donncha O'Callaghan earlier this week and the Munster lock was more than happy to offer any help he could.
"Donncha's been amazing really," she said.
"When he heard our story he got behind us straight away, and said the team would get behind us too. "
Audrey has been overwhelmed by the generosity of the public, and she thanked the staff at CUH's neonatal unit, and her GP Dr Eamonn O'Grady, for their support.
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Photographs courtesy of Katie O'Sullivan