The police have now found the document in which the woman agreed to hand over her daughter for Rs 6 lakhs.
"We recovered papers from the girl and it's clearly written that the mother has sold her daughter to Santra and Tarachand in Kanjar basti for Rs 6 and a half lakh. She took Rs 2 lakh from them on the December 16 and Rs 4 lakh was to be given over the period of the next two months," said Rakesh Verma , Assistant Sub-Inspector of the Anti-Human Trafficking cell.
The child is currently at a nari niketan shelter.
The girl's mother, Rajrani, and the couple, who bought her, have been arrested by the anti-human trafficking cell and are in police custody.
Rajrani, a widow, claims she was being pressurised by her community panchayat to pay fines and to collect money she had 'mortgaged' her daughter.
"No, I did not sell her. I took Rs 2 lakh from him but I gave it back," she claims.