The girl's mother, who recently divorced her husband and had married another man from Jaipur, left her at the residence of the woman whom she referred to as her maternal aunt, before leaving for the Rajasthan's capital on September 4, they said.
Few days after returning from Jaipur, she complained to police that the woman, alongwith her associates, sold her daughter to some unidentified persons in Noida.
A case was registered under relevant sections of IPC at Nand Nagri police station and investigation was initiated.
The girl told police that she was taken for a walk on Janmashtami by the accused woman who was accompanied by another man to Char Khambha in Nand Nagri where three other boys were present.
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"The boys took her to Noida where her marriage was solemnised with a boy. She was allegedly raped by the boy who claimed that he had bought her by paying Rs one lakh to the accused," a police officer said.
Medical examination of the victim has been done and she was counseled by an NGO. Her statement was recorded under section 164 CrPC after which other sections were added to the case registered earlier.