The shooting took place in the La Presa district. The girl told authorities she shot her cousin's husband four times when he entered her home.
The teen said she didn't tell anyone after the 39-year-old man raped her two weeks ago. She told authorities that she was alone when he tried to go into her house Tuesday.
The girl reportedly used her father's gun to shoot the man, who remains in the hospital Wednesday. There is no word on his condition.