PON, It's funny how they perceive things. For instance, it's okay for them to get all pissy and angry and confront, but they don't want us to do it to them. They come up w/all kinds of excuses, just as your wife did about mediation. They say we are unreasonable, we don't listen, we aren't civil, etc. Bottom line, projection on their part. When you are dealing w/her, you need figure out a way to "soften" your body language since the mediator picked up on it. I know you don't want this action to happen and yes, you want things 50/50, but when they do sense the body language, etc., they tend to fall back and remain there for a bit.
They have the best radar system for sensing things w/us that I have ever seen.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.