I think RS said it best. He said she doesn't live in reality and lives for pleasure.
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Since I am a late-comer to the case, I have not really gotten that picture of her so much. Because in recent interviews, etc., she comes off as really mature and poised, plus she did the stuff with her book, her blog, two Facebooks, etc.. But I guess all of that could still be possible while continuing to avoid reality, in fact in the guilty scenario I guess it kind of requires that, now that I think about it!! Hello, Earth to aa9511! Clonk, clonk.
I guess what I'm saying is that I have always heard of the childish Amanda, but not really seen it "first-hand." I didn't see her in the courtroom, I have heard of her smiling and laughing and wearing strange shirts, etc..
From reading part of her book, though, I can see it was there. For example, she herself confirms that when the investigators took her back for a walk-through of the downstairs apartment, she put her booties on that went "Ta-DA!" and did a sweeping motion with her hands.
Also the gymnastics/stretching at the station, and there were other things in the book which she freely admitted to. That is all child-like behavior, IMO, and not congruent with the situation she was in. That would definately signal a lack of attachment with reality.
From reading her own descritions of herself in HER OWN WORDS IN HER OWN BOOK, I can definately see how she used her antics to avoid the reality.
I will say, that in this case, I think the overall purpose of her antics wasn't to avoid the reality - the overall purpose was to
MAKE HERSELF APPEAR CHILD-LIKE AND THUS INCAPABLE OF THE MURDER. I think she knew what was going on every second of every minute. She was following along verrrryyy closely.
She just played dumb. That is the crux of the matter - she played dumb. IMO.