I will let Corri answer directly, but your wife is not going to have a "massive" change. I'm having to come to grips with this myself. She is either going to not change at all, because of all of the damage that's already been done, or she will change incrementally. And yes, if done over time, the incremental changes can ADD UP to "massive" change, but as NOP likes to tell me, "there's no magic here, only hard work."
Not the answer you want to hear, I realize, but I think it's a realistic one. Hopefully, like me, some small signs of effort and progress might encourage you though, since it has gotten SO cold.
