Are you entirely sure of your therapist? Some part of you may fear and not entirely trust him.
Actually, I know for sure that my caretaker doesn't trust him. My caretaker started to trust him, backed off some of the abusive/neglectful ways it regulates the kids, really let them reach out (before we were talking about DID, but still vaguely discussing parts/states). We had an intense experience sitting on the floor together a few different sessions, it triggered some ambivalent feelings, and so I asked if we could have a session on learning to connect/disconnect safely. When we got into that session, he immediately said, "Maybe I should not have sat on the floor with you." I was there 2.5 hours, because it got very unsafe with the kids feeling abandoned. The caretaker doesn't trust my therapist to send them home safe anymore. Doesn't trust him about not abusive the kids to keep them from playing in the street, so-to-speak, either. He has been working with this part for a couple of sessions, trying to get on the same page, but (I have told him this in a journal entry) the caretaker needs him to like vow or something that he's going to be safe with these kids and do whatever it takes to clean up their cuts and bruises and send them home safely.
that kind of freaks me out cause she said she will trash the Ts office ect
My teens threaten to break the glass coffee table that separates me from my therapist, and I told him about those feelings coming up, but not that it was particular parts, because I was still scared he would think I was crazy and wasn't really perceiving "who" they were, except just not me. Luckily, the only part who has asked to interact directly is just really sweet and attached and loves him and would never do anything to distress him, other than maybe asking to be held or saying "I love you" or something. It might distress me, but not my therapist. So, I want to let her say her piece and I'd kind of rather be amnesiac if that is what she's going to say.
Yakusoku, is this part able to come out at home with your husband?
As far as I know, I've never had a part come out and entirely take over (amnesia) with another person...only when I'm alone. Some of my parts do the co-present take-over thing around my husband though. Usually it is caretaker or teen parts that do that around him. The kids don't want anything to do with him, because...
********VERY BIG TRIGGERS********
My husband has sexsomnia and I have had years of episodes (possibly hundreds) of non-consensual initiation in my sleep that I didn't realize I was dissociating the pain/fear from. I have had many more non-consensual or ambivalent experiences than fully consensual sex in my life. The inside kids have gotten caught up in these experiences (I freeze up, feel like it's not him, have nonsensical flashbacks that I don't know are true). I am sleeping on the floor now as a result, because it happens a few times a month if I do not. I accidentally fell asleep in bed and had another episode the other night and now that I am getting to know my parts, I'm sure at least two kids got caught up in it.

*******End Triggers********
So, I don't think the kids will ever feel safe with him.
We have found that the only way to get out of the way is to say everything you are thinking...
The only thing he doesn't know is that she wants to say, "I love you." My therapist even knows that she wants to say something I don't feel I can let her say. I tell him everything they let me say. Sometimes, I try to say it and they block me and I have to negotiate permission to share (don't know if that makes sense) or translate it to not literally quote them. It has gotten better since he brought up DID, because it feels like now they think, "Wait, what? He believes we're here?" so, they are a bit more willing to talk. I guess patience is key.
Maybe I just need to tell her that she's welcome out if that's what she wants, whenever she is ready, and remind him to invite her in the same way periodically. I don't know what else to do. She is the one who is most cooperative with therapy, so I'm definitely most comfortable starting with her. Also, we've identified some really warped ideas from our grandmother sort of raising us into a semi-cult like religion at a young age that are interfering with our therapist's ability to talk about God at all...which is problematic, because faith is a very personal part of both of our lives (we pray in session, etc.). However, whenever he says anything about bringing things to God, the kid just feels pushed away, like a failure, like she can never be good enough, like she's being abandoned to hell or something. He has been very good about not pushing that stuff on me since I told him how the little ones receive it, but I would like the therapist to be able to show this little one why God doesn't have to be so scary and it doesn't mean we can't have people too.