Regarding the role playing, I have wondered about this, too. Her "I love you sweetie, I really do" to Christina in that first jailhouse phone call really was mocking and angry, it made me wonder if this was an imitation of someone she had heard growing up (and I don't necessarily mean one of her parents). You never know. Her smile and wave to her parents in the first hearing had a saccharin, taunting quality. Friends who were interviewed, people who have known her for years, all said, "who is this person, we don't recognize this person at all, KC is not like this at all"....
So I've even wondered if these various personas might actually be more real and separate, i.e. an actual identity problem, dissociative kind of thing.
There are various things that have made me wonder that throughout the case, one very small thing was in that final interview before the last arrest, the way tears actually were steadily streaming from her eyes but she was continually trying to both erase them, and also was looking at the tears on her fingertips in a bizarre way, as if trying to figure out what was coming out of her eyes. It was really weird.
There was a moment during the first hearing, when KC was staring down, she raised her arms up slightly in a defensive posture in front of her, and momentarily she really had a searching, confused expression, like "what happened during the past weeks?" Like she was really trying to remember. Her interviews with LE seemed like that, too, more like confusion than any kind of strategic, purposeful lying, because it was things that would be disproved immediately, and that would only discredit her, she had nothing to gain by it.
I have wondered if there could be some disorder at work that causes her actual confusion, or even lost "time" (or for that matter if there was some kind of event to the brain, for example, some injury or drug usage or being drugged by someone else)....Anyway, if she was experiencing real confusion, she could have lost Caylee because of it, could have left her somewhere, in a car, or wherever, or could have been an easy target for the wrong person.
Also, the talk about JG having had to take her to the hospital for a "seizure", I'd like to hear a lot more about this and I wonder what medical tests might reveal.
But, somehow I think we're unlikely to find out more about this.
Anyway, obviously this is all just one line of speculation, I'm not saying it's true. Just makes me wonder. And excuse my difficulty explaining what I mean, I'm up too late