Somehow she managed to return home and took a nylon rope which she tied to the ceiling and hanged herself, Bulbule said.
Initially, police had registered a case of accident-cum-suicide, but they changed it to murder after investigations revealed that she was provoked into taking the extreme step.
The four accused, all living in the same neighbourhood, have been identified as Amol Laxmi, 22, Raman D'Souza, 21, Ravindra Chindwar, 20, and Rajkumar Yadav, 18.
Bulbule said the accused have been charged with kidnapping, assault, rape and abetting murder.