Do you think that she is afraid that your changes are an act? If thats the case then all you can do is keep it up, eventually she will have to know that this is who you are now.
I wonder if you asked her why she feels like she has to fight it so hard, she would tell you the truth? Maybe just validating her explicit concerns would help her. Im not talking about her just saying "Because Im scared" Im talking about her saying "?Im scared that you have not really changed, that you will still ______" fill in the blank. Then you could ask her, how would she know that you had made that change for real. Im trying to think of solution-oriented ways to have this conversation.
I could try next time she feels like she wants to talk like that... she seems so happy now when she called last night she seemed so happy.. there are some changes in her to take note of and one is why she now wants her kids (befor she could have cared less to even talk to the girls, she would call for me and if i was in the shower or whatever she would tell my daughter just have dad call me back and let her go right away) last night felt odd when she called and had to ask me stuff on our son she needed to know if she should put him to bed in a pullup or not. (since he was with me he is now potty trainned i did nothing special it was just his time he decided he felt he would)