Nicole Morlan of New Mexico, American, is seen watching and encouraging the scuffle between the girls, during which a teacher was also punched and dragged to the floor.
Other pupils can be heard shouting ‘beat the s**t out of her’ before the teacher manages to pin one of the girls to the ground.
The mother has been arrested and faces a charge of contributing to the delinquency of a minor.
If she is found guilty, Morlan could face jail time and thousands of dollars in fines. She has been banned from school grounds for a year.
Daughter Obey Faith Chavez said that her mother was teaching her a lesson in standing up for herself during the footage.