I think a lot of it has to do with the fact that the WAS has been questioning their marriage, albeit silently, for quite a while.
The fact that she feels her world is upside down could be an admission that she's just not sure what's going on. She's with someone else at the moment but it seems its more of a placebo - something to make her think (on the surface) that things are going to get better this way. Deep down inside, she has to know that running away from problems won't fix anything.
In my opinion anyway.
As for how long is too long without contact: I just don't know. In my case, as you know, I've been "lucky" (?) in that I see her every day. In theory, from what I've read, you should probably be going dark and let her initiate contact. The problem is that if you haven't detached enough, it's very difficult. I hope someone else on the board can offer some advice regarding this.
Keep trying to stay positive, at least about your own improvements and the steps you've already taken to GAL.
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Me: 39/W: 37 D13-D11-S8 M/T 14/20
EA confirmed: 9/13/07 D-Bomb: 9/19/07 OM Gone since 12/18/07 W wants to fix marriage: 3/16/07