Don't worry about her negativity or excising her rot. When I stopped worrying about convincing W of her wrongness, and started working on me, she noticed. And I feel like I'm a BABY at this.
PMA is great! Quit worrying about what room she's in. I used to catch myself worrying about whether W was with EA, all worked up, and she would text me something about grocery shopping with step-kids. I realized I was allow negative silly worry to beat me up. I read somewhere that worry doesn't do anything to solve a problem, and its so simple, but so true!