No apologies necessary, but if you do not change the dynamic, she will continue to walk all over you.
In my situation, as with all WASs, my W would only complain and say negative things about me. Being nice wasn't working so there was a point we were driving and she was going off again. I pulled the car over and told her that enough was enough and that if she didn't quickly change her tune, I would leave her on the side of the road. She saw that I meant it and quickly changed her tune.
M-43 W-40 2D - 9 and 5
Emotion, yet peace. Ignorance, yet knowledge. Passion, yet serenity. Chaos, yet harmony. Death, yet a new life.