I definitely agree with allie.
I had trouble about a year and a half ago with my first serious relationship, I had problems with my self-esteem, etc. Now there was this other guy that I went out with for like two weeks or three before we were just friends after but we got kinda really serious last winter. He wanted me to change[to how I was before, supposidly], and I was willing to because I really did love him a lot. I would always have to watch what I said, and when I said something wrong we would argue and then it always ended up with him not talking to me. A month or two ago I just realized that its not worth it to change for him, guys still liked me either way.
So, I think you shouldnt change for her. But, if you want to change for yourself thats a different story.