In 2014 several students complained that she told a student to "shut the f*** up". Webster acknowledged that she used "strong language" but explained that she was upset that equipment had not been set up correctly for a concert.
In 2015 students alleged that she called one student "a prick", said "for f***'s sake" when a student knocked over a guitar, and told another student, "I really want to punch you in the face right now." Webster admitted swearing but said she did it in "stressful" situations.
Finally last year a student recorded her on video belittling a student and calling him "a dick".
This time the school found that "the tone and mannerisms demonstrated in this video were not of a standard expected of a teacher and meet the definition of bullying". She was dismissed and referred to the disciplinary tribunal.
The tribunal said that "ordinarily some form of supervision or mentoring might have been appropriate for conduct of this kind".
However Webster did not respond to the case against her and the tribunal found that her failure to engage constituted further "serious misconduct".
"In doing so, we send a clear message that a teacher who fails to engage with the investigation arm of its professional and regulatory body risks his or her registration," it said.
It censured her and cancelled her teaching registration.