Sources say the teen was discovered just after 1 p.m. by her father, who immediately called police. She has been identified as Sabrina Matthews.
Police set up a crime scene and were interviewing neighbors. There is no word on any suspects.
Neighbors say Sabrina was a good kid who moved with her family from Brooklyn to the Cambria Heights area a few years ago.
Fifteen-year-old neighbor Cheyenne Champagne says Sabrina was a sweet girl who hung out with her, ate junk food and talked about boys.
Police say they have records of three domestic incident reports at Sabrina's home, but there's no history of child welfare agency involvement there.