how often and what time of day do they communicate?

If it's professional she won't mind you having access to her phone and e-mail, her reaction to that proposal would be very telling.

You need facts/proof that they are being unprofessional and having a EA before you can state the boundary.

Boundaries are about stating the behavior that is unacceptable and the consequences for crossing the boundary.

M22,H45,W45 S21/18D12
Retain faith that you will prevail in the end, regardless of the difficulties and at the same time confront the most brutal facts of your current reality, whatever they might be.