Haseemah Diame, a parent and volunteer at Lafayette Elementary School, is facing charges of assault with a deadly weapon after she allegedly snuck a hammer into the school and then attacked the 9-year-old girl with it.
Diame and the victim are both immigrants from Yemen. The girl was taken to the hospital with non-life threatening injuries.
"The child was conscious during this process and in remarkably good spirits considering the incredible trauma she'd been through," said Oakland school district spokesperson Troy Flynt, according to ABC 7 News.
Diemi's daughter is a second grader at the school.
"The preliminary speculation is that this was part of a family feud and some sort of revenge in the pursuit of that family feud," he said. "There's apparently an ongoing rivalry or feud between families, and this may have been an act of retribution or vengeance as part of that feud."