Dr. Feelgood writes:
After reading about Z in your 'estrogen files' posting, I couldn't help but think of Post Traumatic Stress Disorder. Here is an interesting introduction from the Department of Veterans' Affairs.
Of course I could be way off base, perhaps it's another problem, or perhaps she's just a little spacey and detached. The line between 'normal' and 'disorder' is often blurred, but after reading about your description I think the DVA article might have some clues. In any event, it's an interesting read.