The victim's body was recovered from a field in Aithpura village on Saturday with her face mutilated, they said, adding her postmortem report, which was received today, found that she was gangraped and later strangulated.
Police said that acid was detected from the stomach of the victim, which indicated that she was forced to drink it before being murdered.
Her face was mutilated by pouring acid and petrol to conceal her identity, they added.
SSP J Ravindra Gaur said there was a possibility of the victim hailing from Uttrakhand, and therefore a team has been dispatched there for investigation.
It is being suspected that it could be a case of honour killing or could be related to flesh trade, he said.