I would have to guess the same. Even if she thinks everything is so fabulous right now, she's going to bottom out. Please.. you don't give up ten years together without some kind of feelings of sadness and remorse.
She also needed that "God" moment to justify her "happiness". To make herself feel that the girls are fine with being ripped out of their home 50% of the time.
Take care today.. Unfortunately, your roller coaster ride isn't over yet.
