It's called the roller coaster, and it sux. But, it's part of the path back to your M.
I would not bring up the R. Let her do that. If she brings it up, listen, but do not get too excited. This is a slow process.
One thing I had to correct in my way of thinking is not to try to read anything into W's actions or words. Accept a positive change for what it is and nothing more. The saying about a WAW is Don't believe anything they say and only half of what they do.
It sounds like her asking if you are going to call is a positive. Just file it away and stick with the program.
No kidding that the kids make this gut wrenching. I have 2, and they are the most wonderful things in my life. Part of the reason I fell so compelled not to give up on my M is that one day when they are older, they will ask what happened (I came from a divorced family and I asked when I was older). I want to be able to look them in the eyes and tell them I did everything I could to save our family and the M. I do not know what my W will tell them if she goes through with the D.
One of the great things is that I have focused on myself and my kids the last 4 weeks. Took my S out of town last weekend - just he and I. It was great.