Start learning how to say no. Realize that when you start to take this power back, you will receive a LOT of hate from your WW, and that's because she knows you're conditioned to give her whatever she wants in the name of peace.
It's REALLY hard for NGs to deal with, but in the end you have to do it. Because you sure can't let your WW keep using you, and in the future, you need to stop being MNG in order to have a functional relationship with her, or someone else.
I know it [censored] to be where you are right now, I know how hard it is to stay detached from someone who knows what buttons to press, but hang in there and dig deep.
