I'm wary of diagnosing people's mental health remotely.
FWIW I think a skilled mental health practitioner could find that she has about 5 diagnosable conditions.
I think she's not that bright but she does have a "lizard" brain that is oriented to her own survival at whatever cost.
All those adverse things that happened to her, she never got herself proper help and those close family and friends around her encouraged her in the stupidity.
I was agnostic about Katie, until I ran the London marathon in 2018. Through a massive piece of luck - I was given (undeservedly) a VIP pass. The start time was 1000 and we were waiting around at 9.50, I was chatting to people in the tent and the nicest, kindest person I spoke to was Katie's marathon coach. He was worried that Katie wouldn't show as she was running for British Lung foundation charity that day
It would be her third time to line up for the London Marathon
www.runnersworld.com
In the end she pulled out after about 10k but I realised then that she was just so fake. She gets good people (like the running coach) involved and makes them look stupid by her crass behaviour.