Police were called to Architecture Way, Point Cook this evening about 8 pm after reports of a fight between a number of people.
On arrival police located a 19-year-old woman unconscious on the ground.
Ambulance Victoria assisted the woman at the scene for approximately 20 minutes before taking her to the hospital for treatment.
One male at the scene said that the woman had been badly beaten and believed that she would have suffered broken bones as well.
The incident is being investigated.