Does she stop mocking you (can you tell) when you finally tell her to stop or does she always come back with the "now you see me as the mother and you the little girl"?

It does sound like she might still be helping you; as painful as her approach seems to be. It sounds extremely painful and I am not sure it does not slow down your progress. However, you have made progress with this T, you believe in her methods, and you still see progress happening. Perhaps a second T that is more just for support and not trauma work would be helpful, someplace where you can vent these thoughts and feelings so that you don't get caught up so much in the dynamic with your T. Just a thought.

I am sorry that your process is so hard. I wish there was an easier way for you. I know I would not be strong enough to stay with a T that worked with this method. I hope you feel good that you continue on your process even in the face of this amount of pain and confusion.