"We have arrested Puja Singh from Rashbehari area of south Kolkata in the evening. She was alone. We have brought her to the Lake Town police station," officer-in-charge of the Lake Town police station Ashok Sen told PTI.
The incident came to light on Wednesday after a CCTV footage showed the tutor mercilessly beating and torturing the kid.
But the family registered the police complaint after her husband came and threatened them not to lodge a complaint.
The incident was condemned by people cutting across political lines.
After the incident created a big furore, Singh went underground.