Calm has returned to the streets of Pretoria following a chaotic march against immigrants on Friday..
The video, captured by a pupil on a cellphone, shows the wife of the principal manhandling a Grade 10 girl and the girl retaliating by grabbing the woman.
The incident occurred at the Cultura High School in Bronkhorstspruit, Gauteng, on August 13 after a teacher allegedly accused the girl of tearing up a book.
Pupils told Sowetan the principal's wife was "always at the school".
The pupil was charged at a disciplinary hearing, which will sit again next week, with assault, threatening, disrupting and frustrating teaching or learning in a class.
The Cultura High School's principal, Johann Hermanus Els, declined to comment.
The school governing body chairman Barry Mashego said he would give the Gauteng education department a full report after the hearing.
The department condemned the incident, saying the head of the department was investigating the matter.
Spokesman Charles Phahlane said: "No one who is not a teacher or a parent with an appointment is allowed on school premises during school hours."