I want to say this as kindly as possible, please do not take offense as it is certainly not meant that way. I have a background in psychology, although admittadly abuse is not my field.
I think it is awesome that you want to help your parnter as much as possible. That is certainly to be admired! I want to caution you, though, to be aware of the potential danger of ultimately defining yourself as the one who "saved" her from her bad situation. Try not to let too much of your identity and your relationship with her get tied up in the victim/savior roles. I'm sure there are many aspects of your relationship that we will never know. Make sure those aspects are getting attention they need and that the whole relationship doesn't become all about removing her from her mother. In the end, that is no more healthy than staying in the abusive situation.
Best of luck to you!
The thing is, I really, really, really don't define myself as having been the one to save her! But when somebody comes on here saying that I'm not doing a darned thing for her, then I kinda have no choice but to explain that yes, I have done a lot and just because I have no plans to do it his/her way that does not mean I am not there for her and care for her. Truly, I was just so exasperated that no matter what I said, this person kept telling me to DO SOMETHING as though I were sitting on my fanny watching the person I love get abused. Ugh! That's enough to make a saint turn defensive.
The truth is, my gf has saved me in more ways than I could ever save her. I have lupus and MS, and when I met her I was as close to despair as I ever thought possible. The steroids made me gain a lot of weight, I felt ugly, unhealthy, and basically doomed. She is the one who came along and helped me to realize that life could still be worth living. She makes me feel beautiful again. I have been happier, free, and far, far more in control of my disease. She has made me realize that I'm a person and not an illness, and honestly, she has changed my life in so many ways that if anything, I tend to look at it as though she is the knight in shining armor!
Avoiding co-dependence has been very important to me, which is why I went into therapy very shortly after she and I started dating. I've been very glad along the way that I have had my therapist to talk to because I sometimes feel that my partner would like to hand over the power her mother used to have over her to me. It can be very hard at times because I feel she would happily give me what I want or give me my way all the time. I'm very honest with her when I think she is doing this and we step back and discuss this. That is something I admire very much about her...she is never afraid to look deep into her motives. I do my best to notice things when they become unhealthy and bring them up to her and we analyze the situation and usually come to a better place. One thing that used to drive me crazy is that she used to tell me I was perfect all the time.

I don't want anybody to see me that way because I am an extremely flawed person! We all are! I told her it made me very uncomfortable when she said that because I know I'm not perfect and that the higher she puts me in the pedestal, the more it'll hurt us both when I go crashing down! So we talked it through and these days she tells me I'm perfect for her. But certainly she knows my flaws now that we've been together for a year!
95% of our relationship is about us. But you're right in that her mom is a huge issue and we are both very involved in trying to free her. It does seem to take up less and less of her time as she works through more issues, comes closer to her personal freedom, and confides more into her therapist.
But all that aside, yes, there really are many aspects of our relationship that I have not posted about here. When somebody comes to a message board and presents a problem in seek of advice, they rarely go into detail about the good....and in our case, the good is quite extensive. We really are wonderful partners and soul mates. When she left the military 13 years ago, it broke my heart and took years and years to get over her. I had moved on to other relatinships, but my heart was with her for a very, very long time. My feelings about her are not based on pity or the need to save her. Fourteen years ago, she didn't need saving, she was a very strong woman (and still is). Today, thirteen years later, she simply as a problem that she needed help in solving.
Thanks for posting. You do make a lot of good points. Sometimes it can be hard on a message board to stay focused on what you're trying to say and end up getting very defensive. Ugh. In some ways I feel I should have known better than to post this, but on the other hand I got a lot of good insight from the others and you as well!