The police were looking for the woman, Rosy Ferros, whom the victim had referred to as "aunty" in her statement since May 4. She has been booked for trafficking along with the girl's mother.
Police also conducted 'panchnama' (crime scene inspection) at a four-star hotel at Miramar beach in Goa where Monserratte, former Education Minister, allegedly met the victim for the first time with Ferros.
Monserratte was arrested two days ago and sent to police custody for allegedly "buying" and sexually exploiting the girl. The victim's mother too was arrested.
The girl, in her statement to the police, had claimed she was sold by her mother to Monserratte in March for Rs 50 lakh. Ferros allegedly brokered the deal.
More From This Section
Monserratte, MLA from St Cruz constituency, was yesterday remanded to three-days police custody by a magistrate's court. He would be presented before the Goa Children's Court on Monday.
(Reopens CAL2)
Dorphang has another FIR filed against him by the SCPCR in Ri-Bhoi district based on a statement of the victim that she was also sexually assaulted at a guest house in that district, the police officer said.
The sex racket came to light after an employee of a guest house owned by senior Congress leader and Home Minister's son was arrested on charge of sexually exploiting the victim last month.
The victim was rescued from near the guest house and brought to the police station where she named all those involved in the crime.
The SP (City) has said more arrests will follow as the investigation is on.