I know it's not easy feeling like you are on the sidelines. Not being able to get W to see reason and fix the situation with her.
Don't do that though. For now and in the near future, resist the urge to 'fix' W and see your point. Also, try to avoid the 'I love you's,' the 'R' talks and basically chasing after W. They can chase an S away when they are running like this. Happens like clockwork actually.
Let W initiate these talks. Otherwise, be pleasant and diplomatic. Be her friend even. Listen to her. If she has some good points to make certainly, take them to heart. However, If she drops another bomb or something off the wall, take it in stride. As above, vent somewhere else on this (here is a good place, or even a trusted friend or C.) If she starts getting unfair then please refer to my above post.
I know things are...well...crappy right now. But, a wise person told me just after my W gave me the bomb, 'this may not be easy but, at the moment you have to resist the urge in feeling sorry for yourself. Knuckle down. Things get better, especially if you get your a@$ back up and make it better. Be a smart about this, you're better than that!' (Sorry about the direct language but that is what I was told.) I've never stopped thanking that person to this day,
Coyote Boy
I haven't posted much in the last seven years. I've been a lurker. Just lookin' to put back all the good help I've gotten...