[Death by Mirrors]

If it's of any solace, at this point she probably isn't aware that her brain is acting weird. As in, she forgets and "unlearns" things, but also forgets that she's forgetting them. So in a strange way it's a more peaceful state of being for her than in the beginning while she still realizes her mind deteriorates.

(Of course it's still tough to see a person you once loved more or less vanish before your eyes. My grandpa was like that a few months before his death... *hugs*)