I believe that some of her behaviour may be down to both undiagnosed ASD and having been bullied as a child / teenager. The possibility of ASD has been discussed previously by myself and others. The current behaviour smacks of a failure to overcome the effect of this bullying. It's as if she is sticking two finger up at the mean girls who gave her shit in her youth. Evidence of this is her continual bragging, her desire to show how "popular" she is, her showing the fun in the sun lifestyle / living differently bullshit in Bali and now the Northcote Rd stuff which is just a London version of the Bali content. She is clearly trying to show someone that her life is great rather than actually living her own life on her own terms. It's sad if this is true and I suspect it is but she's impossible to feel sorry. For many reasons.
I think her Parents are a factor too. She has a strange relationship with them too.