I'm glad you had contact with T; it seems that it helped at least a little!
I think you are right about the effect of the change in therapy method.....it does sound rather a dramatic, overwhelming change to do therapy that doesn't delve into background details so much and then in one swoop, like reversing course in a way, telling a hard story like this. Wow. I think it would take my breath away and seriously rock me too.
I think it's also true that if your T has intense feelings of deep care/love toward you that it affects how well she handles your outpouring of raw pain and how objective her immediate response is. I'm sure it was tough for her. But I think it will be healing for you on a deep level in working through this with a T who does love you....