Kiya,
Talk to your alter. Find out what it is with therapy. Would she be better with a different therapist? Is she just scared? Does she feel threatened because the secretes are coming out?
Both she and you need to understand that therapy is there to help you. Do not give up on it. The system needs to work together and begin to trust each other and trust a T. Keep try in Kiya.
As for the safe room, maybe it is time to build one? Maybe ask the others to help you create the room, what do you all want in it? Books? Coloring books and crayons? Journals? Chair? Couch? Bed? Carpet? You all decide and make the room together. This is where alters who are not safe will go until they are ready to be nice to the body.
You also might wat to consider having a gate keeper, one who makes sure it is appropriate for an alter to be out. Just some thoughts.
Good luck! I hope things get better!

Celtic