Some of her behaviours are definitely not normal - for example her seemingly compulsive lying - and she has definitely experienced things that could have affected her underlying mental state and approach to life for the worse, like her odd (and yes, super privileged in terms of money and opportunity) home life, history of disordered eating, people constantly arselicking her, etc.. I think it's OK to comment on her behaviours and experiences she's made public and that affect other people (I wouldn't feel OK discussing super, super private stuff). But IMHO it's difficult if not impossible to accurately label her with a neurological condition, especially one that you are born with.
I think the one thing we can all agree on is that some of the things she does are completely batshit, irrational, unfair and manipulative. Generally, nearly everyone that does batshit things has some developmental reason as to why they do it, so it doesn't make it OK.