The accused, including two women, befriended the minor in April under the pretext of offering her professional training to work in a doctor's clinic, Inspector S H Patil of Nalla Sopara police station said yesterday.
The duo, however, took the victim to the house of one of the women and apparently detained her there for over last three months during which they forced her into prostitution, he said.
The girl somehow managed to escape from the house and approached police.
No arrest is made in the case so far.