The girl, who sustained injuries on her body and palms, has been admitted in a private hospital here, they said.
They said the incident took place yesterday while the girl's parents were away from home.
The girl's family had earlier filed a complaint against one of the gang members who is also their neighbour, for allegedly stalking the girl.
Police suspect this could be one of the reasons for the girl being targeted.
Her parents alleged that police did not act on their complaint against the youth for disturbing their daughter.