Teacher Asking Student To Do Something Against IEP

My 12yo sibling has had on going issues with her music teacher forcing her to stand on the risers during her concerts and class to the point she was getting so stressed she started skipping class to hide in the nurse. We got it formally written in her IEP as such “placement off risers and on the floor for choir and musical practice” At first this seemed to resolve the issue but then it began again this year, after reiterating the IEP amendment to the teacher we thought it was once again resolved until my sibling came home crying that the teacher keeps asking/telling her to go on the risers.

According to my sibling it the teacher began by saying “do you want to join friends name on the risers?” And it continued to evolve to “do you want to go on the risers?” “Will you go on the risers” and now according to my sibling she is now just saying “childs name get on the risers”

Is this a violation of her IEP? What can be done? We are in NY State if that helps, we’ve also reached out to the teacher, her IEP team, her Prinicpal, and now the superintendent who seem generally unhelpful at this point. Anya device would be greatly appreciated