BTW, your IEP has "stay-put" provisions in it, procedurally.

What does that document state about communication between you and the classroom teacher?

If it's mandated that you (or s/he) be communicating with one another, then your princ. is wilfully violating that document, and you need to document this thoroughly and prepare a complaint.

By all means give the district time to resolve it before filing that complaint-- but let them know that you're aware it's a major procedural violation.

That's important because the feds generally don't enforce specific accommodations/provisions with the same vigor that they pursue procedural violations as I suspect this is.

Schrödinger's cat walks into a bar. And doesn't.