Yeahhhh...man, Granite, I try to give your T the benefit of the doubt because it seems she truly does care...but even if you confuse her and your mother, she really should have figurd out a better way to deal with your trauma and abuse. There HAS to be antoher way to have you calm down and come back to the present when you start hearing the mother.
I will keep saying this until you listen to me (

), but I think talking with this sort of trauma will not help you, at least not right now. I really, really think you should try to maybe seek out a trauma T, one that isn't based solely on talking, just to get a different perspective.
I want you to start feeling okay about therapy, and more okay with your life. You deserve it.