Police Commissioner Ray Kelly said officers had taken two computers from the home of Gabrielle Molina to determine whether online messages and cyberbullying were a factor in her death, CNN reported Friday.
Police have interviewed her friends and relatives, Kelly said.
Family members found Molina hanging by a belt in a bedroom of her Queens home Wednesday afternoon, the New York Post reported.
Her 15-year-old sister broke down the door to the room after Gabrielle didn't answer.
The girl left behind a note apologizing to her family and detailing how classmates had constantly harassed her.