I did want to state that if there is a personality disorder here-and in the same way that I can't conceive that a sane person can deliberately carry out mass murder I can't believe that a person with a stable mindset can deliberately continue to act in a way that brings disgrace to herself and her family.
I'm not sure I agree with the concept of "personality disorder" in the sense of an illness that can be "treated." Secondly, I don't know Sarah personally and can't diagnose someone I don't know.
But I do agree with the statement that "I can't believe that a person with a stable mindset can deliberately act in a way that brings disgrace to herself and her family." would act like Sarah. I figure Sarah must want a happy life as much as the rest of us do, so why is she choosing to act in a manner that is sabotaging all her chances of living "happily ever after"? Like Dr. Phil apparently said, if Sarah just withdrew from the limelight, so many of her problems would be solved. But she is clinging to public life at all costs, even at the expense of her reputation. It's like Sarah thinks that negative attention is better than no attention.
Perhaps it's like a very delayed identity crisis. I think Sarah is denial and running away from something as fast as she can...and that "something" is the reality that she's no longer royal and is an ordinary person just like everyone else.