Kim, who is a first year student in NUI Maynooth, was making her way to her digs in the Moyglare Abbey estate when she was assaulted on November 20.
Launching an investigation into the shocking incident, Gardaí took more than 200 statements, and it has been confirmed that three women are currently under investigation.
"Three young females are being investigated for the attack, and it is hoped that they will be interviewed in the coming days," a source revealed.
Urging the public to come forward with any information they may have, a senior officer reinforced the importance of the appeal.
"They can come back to Gardaí in full confidence, they will not be in trouble or anything like that. Their information could be crucial," he said.
Kym, who is currently receiving treatment in James Connolly Memorial Hospital in Blanchardstown, sustained sever injuries during the assault including broken eye sockets, a broken jaw and a broken nose.