Hi onlymedid,
Welcome to PC!
I hear your frustration and I'm sorry it's so hard.
I am not an expert or professional but I don't think forcing anyone, especially people with DID, to do something against their will would be beneficial. Could be a small part of the reason she is angry.
It's too reminiscent of past abuse, in my opinion. I think as you go along she may want to be heard (or not) or she will be triggered out but she is listening so that's a start. Trust is major. It may take a while for her/everyone to feel more together and work as a group. But all groups/systems/families are different so what I just said may not even apply, lol.
Petunia