As per the survivor's police complaint, the two women were arrested by personnel of the 158th battalion of the BSF while they were illegally entering India through the Jhaudanga border.
Neelagiri Narsaiah (30), a labourer, had raped a woman on the banks of the Musi river under the Mothkur police station in Yadagirigutta in October 2011.
Chandrama Rajbhar, 24, was arrested on Sunday for repeatedly raping the 17-year-old girl for the past one year, Station House Officer, Sukhpura, Virendra Yadav said.
The assault came to light after the girl, staying with her mother, brother and grandparents, told about the abuse to one of her relatives 10 days ago, the police said.
The police officer, however, added that she frequently changed her statements and also said that she was not aware how she reached the hospital from the third floor of her college building.