Can you write her back with an understanding e_mail? such as "it sure sounds like you are angry. I am willing to listen and talk about it any time but I feel I can't really listen when bombarded with accusations." or something similar to that. I found that being open and willing to listen to insiders helps. also by setting boundaries, such as not responding to verbal abuse or "acting out" gives them a lesson into boundaries and eventually becomes a tool for them also.
I treat my inside teens like I treated my sons when they were teens. The same rules, boundaries, etc. It helped me.