Senior superintendent of police Neelabjo Chowdhary told IANS over telephone that a complaint was registered by the victim March 11 and three people were arrested the next day.
Chowdhary said now an additional charge of abetment to suicide would be slapped against the accused.
The girl had accused a neighbour, Danish, of harassing her. But pressure was mounted on her family to withdraw the complaint.
Taken aback by the developments and hurt by the pressure on her family, the frustrated girl doused herself with kerosene and set herself on fire in Moradabad, some 160 kilometres from New Delhi, police said.