You are not your mother and the horrible way she treated you. I know this is true because you are on this forum, searching how to heal your mother wound and you sound like you are very passionate about it. I'm sure your real mother never thought about healing her mother wound, or whatever wounds she had.

I think being or feeling stuck is a natural part of the process, although a very frustrating part that can drag on the more we fight it. Honestly it sounds like you are already feeling your pain, the hurt and anger at how you were treated and how unfair it all is.

The ache, void and pain from this childhood trauma doesn't go away, for me anyway. I think the aim is to just grow and get 'bigger' than our grief of what we experienced. It sounds like you are on that path already, working with a therapist that you trust and going through the fire. I know it hurts, I'm there too. Let's keep going.