The incident took place yesterday when the girl returned from school. She then sprinkled kerosene oil on herself and set herself ablaze, SP (City) Sameer Saurabh said.
The girl died during treatment today, he said.
As per the complaint filed by the victim's family members, Ankit, a classmate of the girl, used to tease her on the way to school.
They alleged that they had informed the police about the matter earlier but no action was taken.
The police said the boy had allegedly misbehaved with the girl yesterday following which she took the drastic step.