Silver's got something there... The last thing a WAS wants to do is show affection for the LBS, that's almost like admitting guilt! I really think Silver is right on: the LBS will be the last to know she's thinking differently.
I would really stay the course and keep doing consistently what has worked so far. Give it some more time, things seem to be changing on her end, so you should not change anything. She seems to be enjoying doing things with the kids, that's a pretty big contrast to her usual behavior regarding the kids! See where this is going.
