Superintendent of Police Sunil Chowdhury said the girl turned up at the police station alone around 7 pm and deposed before the OC.
She was now at the police station and will be produced in the Juvenile Court tomorrow before being handed over to her parents, the SP said.
"We will look into all the angles regarding the disappearance of the girl. An investigation is on," the senior officer said.
Earlier in the day, NCW Chairperson Lalitha Kumaramangalam led a three-member NCW team to Enayatpur in Mograhat in South 24-Parganas district where the girl's residence is located.
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Before visiting Mograhat, the team met the girl's parents in Kolkata.
Kumarmangalam said that the parents of the girl appeared to be scared and so were the women living near her house at Enayatpur.
The NCW team had also met District Magistrate P B Salim and SP.