Who knows, maybe one day she'll see it as a big mistake and want to come back. But I don't know how I would accept that.
I think she probably will. The OM is the kind of guy that would sleep with a married woman with kids. When their R becomes "real" if he even wants that, it's the beginning of the end. But you need to move on, you can always make those decisions later if you need or want to.
The Saturday thing sounds good. You need to do lots of GALing now. I think it's a good thing that things are out in the open. The way she was blaming you for the problems in the R, is classic with those involved in EA/PA. With time, I've realized it's just easier for the WAS to rationalize it's all the LBS fault rather than look at themselves. My X had me believing I was the most horrible person ever; I think you'll find that your self-confidence and PMA and general feeling of good health will improve a lot once she's out of the house (my daily migraines disappeared I found).
Speaking of, how is that going? It seems like this upcoming weekend would be a good time right, if not before??? If she doesn't start packing up her stuff, I agree with robx about that.