Baileigh Karam, 14, disappeared last Friday after a cell phone video (below) of her being bullied was posted on Facebook.
Baileigh, of Carlsbad, California, is heard on the video begging her attacker to stop, reports The Daily Mail.
Baileigh's mother, Karen Karam, told CBS8: "A girl and her boyfriend had broken up and Baileigh and the other boy started liking each other and had a connection, and the other girl clearly didn't like that. Then the threats started coming."
"The other girl just punched her over and over and over, while my daughter was saying 'stop, stop.' And the crowd was egging it on. I don't know where she is. I just want to get her home. We just need her here. We need to know she's healthy and safe."
Karen warned the school that Baileigh was being bullied, and school officials reportedly spoke with each of the girls before the fight.
After the fight, students posted videos of the bullying on Facebook and made comments, many of them negative.
Karen added: "It's a very ugly world sometimes on Facebook. I know my daughter's out there reading all of those comments. And I know she's heartbroken. And I know she's humiliated in front of her high school."