I don't know. But now she's all about "it's Miss Someone or Me, for evermore, and I want to know now."
I have to admit I almost do feel sorry for her. It sounds like all this has been festering away for a very long time .... longer than you've been married, probably. She's fighting demons that may have little to do with you, and I hope she gets some help she can accept and utilize.
"Almost" has nothing to do with it from my POV -- I do feel sorry for her. And I agree -- this stuff is coming from deep well that needs to get explored.
decisions made under the influence of *any* strong emotion are ripe for regrets later, IMHO.