You seem to think it is an insult to Diana to believe she had a personality disorder. It is an medical condition. If she suffered from a personality disorder, it was not her fault. She should have taken responsibility for getting help, but it is extremely difficult for people with some mental health problems to understand they need help It's part of the disease.
I don't know why you get this impression. I am also saying Diana had depression, which is also one kind of mental illness, but I don't think I am insulting her. I don't buy the BPD theory is simply because there are not enough substantious evidences out there to make me believe that.
With regard to abandonment issues, it would not be accurate to say that someone with a personality disorder feels abandoned every time she is physically separated from another person. Diana would have feared emotional abandonment, not necessarily physical abandonment. As long as she was confident the other person cared for her, she was probably fine when they physically separated.
If she felt she was at risk of being emotional abandoned by her lovers, wasn't she have every ounce of right to have fear of abandonment? Actually, Abandonment fear to some degree is a normal part of human being, which roots from our baby time. We can not treat each fearness of abandoment as something abnormal. That is why (according to wikipedia), when we diagnose BPD we need to see whether the pattern of abandonment fear (or *extremes* of idealization and devaluation) is "inlfexible, persavsive across a wide range of situations, regular and long-lasting".
Personality disorder - Wikipedia, the free encyclopedia
We can not say, "Oh, Diana had once or twice showed fear of abandonment when she was with Oliver Hoare, when she was with Hasnar Khan,... so she was likely to have BPD." No, we can not say that, because the pattern of her fear was random, not on a regular basis.
I have read several cases of people who are indeed diagosed with BPD, the pattern of their abandonment fear is really inflexible and persavive across a wide range of situations, in the sense that no matter how their partners were caring, understanding and loyal to them, they are still suspecious of their partners' love. And this kind of suspecion happens even on a daily basis.
Also, she certainly publicly criticized Charles, who was an ex-lover. She didn't really criticize her other lovers because she wasn't necessarily anxious to publicly admit she had other lovers during her marriage.
There are books about Diana written by her lover (Hewitt), by her bulter, by her personal guard, by her secretary, by her astrologists, and by a lengend of biographers (pro-her or anti-her) who had sources from an army of friends or close friends of her. So we really know a lot of her private life. However, none of this book has ever given even one such example of her complaining or bad-mouthing her ex-lovers except for Charles. Even if she publicly criticized Charles, so what, almost every divorced couple play the same blaming game, she is not an exception. If you want to prove she had BPD, not only you have to provide evidences to show that such critization is a manifestation of a pattern of unstable and intense relationships characterized by alternating between *extremes* of idealization and devaluation, but also you have to show that these extremes of idealization and devaluation happened on an inflexible, and regular basis.