The shooting happened at about 1 a.m. Friday at a home in the 100 block of Greyfriar Drive. Authorities say the girl was at her boyfriend's house with his other family members at the home.
Harris County Sheriff Ed Gonzalez posted that the preliminary information is that a shotgun fell off a bed and discharged when it hit the floor. The girl, whose name has not been released, was hit in the stomach.
The victim was taken to a hospital by ambulance in critical condition.