You may contact your administrator and see. It never hurts to ask. I would hope your family would see what she is doing. The fact that she removed her replies would tell me if I were reading it that she wrote something that she didn't want others to see that would cast her in a bad light. She might have even edited what you said.
Heck anybody can make up a phony email.
Sorry to hear about your situation. Sounds like the kind of drama that goes on in some of the branches in my family tree. LOL.