OAKLAND (AP) — A San Francisco Bay Area woman is accused of attacked a 9-year-old girl with a hammer at the girl’s elementary school.

Oakland Unified School District spokesman Troy Flint says the woman, who authorities declined to identify, sneaked the hammer onto the campus of Lafayette Elementary School on Friday and attacked the girl inside a bathroom.

Flint says the woman’s own child attends the school and that she frequently volunteers there.

Flint says the girl was taken to a hospital with injuries but that she was conscious and expected to recover.

The woman, who is believed to be feuding with the victim’s family, was arrested on suspicion of assault with a deadly weapon.