will you accept your child to sit outside of the classroom during the class

mow-mow

I agree that the school should have informed the parents, but on the other hand, I am afraid the parents also have to shoulder the blame for not taking the initiative to talk to the school & therefore allowing this situation to continue for this length of time!
Why wait for the teacher to talk to you?
Go & seek her out yourself & get to the bottom of the situation.