The girl, a final year student of computer science, left home on January 4, following which, on January 15 her father lodged a case against unknown people for kidnapping her, a police spokesperson said.
Following a complaint by the girl's father, police tracked her phone call details and traced her staying at the woman's house in Dewri, Agra.
Three days back, the girl and the 25-year-old woman, who runs a cosmetic shop in Dewri, appeared before the SDM and Saran police station in charge here and presented an 'affidavit' of their 'marriage', he said.