Ah yes ... splitting! I could stay away from family, friends, etc... for long periods of time, if they were on my 'black' list.
There is black & white ... no gray. All though NOW there is gray ... but before meds, there wasn't.
I can see Casey pushing her parents away, her brother ...etc., to 'get back' for something, or just having them on her 'black' list. I'm not sure what for ... but, that just might be.
For some reason though, I just don't see her killing Caylee. Don't know why ... and I may absolutely be wrong, but I don't know, it's just something that doesn't seem typical of a Borderline, if anything ... they would kill themselves first.