I remember her younger sister saying in an interview some time ago that the difference between she and Britney is that Britney "has a lot more energy..she's busy all the time". At the time, it seemed like a slightly odd statement, but easily explained--type A personality, ambition, etc. I have always seriously wondered if Britney is bipolar, but obviously I have no way of knowing. Her behavior is bizarre enough to hint that she may indeed be psychotic, and the grandiosity (acting roles) and rejection of her mother (the person who 'mistakenly' thinks she is ill) are consistent with bipolar disorder. The post-partum issue may be at play too. Once again, I have no way of assessing her, but she is behaving very oddly in public. If she is this odd in public, I can't begin to imagine what she is doing in private.