The three different "personality" thing that is mentioned rang true for me. I was "blessed" to have to the opportunity to see it first hand on Thanksgiving. Very very strange. I think I posted about it. My ex sat at the dining room table with me and our two children and begain to tell me about going to the strip club with her friend right in front of the kids. Her voice, body language, EVERYTHING, matched that of a teenager.
I also got to see a very quiet, withdrawn person that day, and then of course my wife of old sort of.
Again every person is different, I just wanted to caution you. If you do happened to witness this. I think this tends to happen throughout the crisis and doesn't mean they are nearing the end.
