update

I've asked the behavior psychologist again, and she again said that a crate is out of the question. Her barrier issues are too strong, so she'll end up injuring herself when she's alone.

We've tried to restrict her access in the house to just our room (in the back of the apartment, very secluded). We basically went through all of the crate training protocols for the room, even though she's already fully comfortable in there (she sleeps in there with us). We've tried leaving her in there while we're gone, and again, she barks and tries to escape. Once she's out, she'll run up and down the house barking and howling.

I'm really at a loss.