Document EVERYTHING... and Talk to the Director, IMMEDIATELY.
This has to STOP. And stop now.
They need to be expelled from the school.
You get an Attorney if need be.... because people like that, think they are 'angels' and that everyone else is wrong.
If they retaliate, you need to call the Cops.
I would have never, let this go on for 2 months.
You do NOT tell a child, to 'ignore' things like this. That is sending them the wrong message.... you are teaching them to be a "Victim."
You need to teach your child... HOW TO STAND UP FOR herself, and HOW TO TELL THE TEACHER, or any adult in command.
Do not approach the woman/child yourself, They will only hold it against you and manipulate what you say and then "blame' you and your child.
My Daughter was bullied. I took care of it RIGHT then. I spoke to the Teacher, and Principal and put it in writing as well.
I was ready to do whatever I had to... to stop it.