It was learnt the girl went to the house of Chandiwala, who is the leader of Bharatiya Janata Yuva Morcha in Badnagar, 45km from Ujjain, for some work on May 19. Chandiwala and his friend Manoj sexually assaulted her in the house and threatened to kill her if she spoke about the crime to anyone.
The girl was then handed over to the arrested trio, who raped her the next day. She was abandoned in Ujjain and found by a relative who handed her over to her parents on May 21.
A police official said the doctors, who examined the girl, have asked for a DNA test of the accused.