I'm no expert with this, having only come out to my wife a few months ago, and nobody else yet, but I do think that some people go back and forth with their emotions over time. I bet it's not uncommon for someone to go through the initial stages, finally arrive at something like acceptance, and then, sometime later, a stray thought will send them back through some of the earlier stages again. I think I've observed that in myself. Try not to be too hard on her, give her a bit of time, she may come around again. Otherwise, I'd guess some heartfelt conversation is in order. Sure wish all this wasn't SOooo hard...