Hey AC, in MLCland, there's a type that's called "the vanisher". They can disappear at any time, during or after. I'm sure that's not an odd thing even for a WAS.
If it's "different" than her past behaviour of contact, then the papers could be the trigger. Certainly there are people who see the rubber stamp as some transition to a new life. It could be a coping mechanism although it could just as easily be because she feels no further need to communicate with you. She has a new life, now.
My W is like that. If it wasn't for the kids or the need to process the SA, I am confident there would be zero contact. There is no doubt in my mind that it is both anger and perhaps a little remorse that is preventing her from wanting to communicate with me. Of course, it didn't help that I was clingy and pursuing early on. She would not want that to recur.
Was your W and your sister "good friends" in the past, prior to bomb?
