I don't think her family (Sophie, PP Fencing, Amy) have any morals either, they just enable her, they have benefited financially from their links to her too so there is or was a financial dependence there. She is like the shining star in that family. None of them will give her a good dose of pragmatism and tell her that her behaviour is appalling.
I know that usually people put up with more tit from a family member than anyone else because of blood (loyalty/love) but KP behaviour is gone way beyond that, personally I would have cut her off years ago.
I do wonder about Danny, he never seems to be pictured with her or mentioned. I know its been said they fell out over money, but maybe he's unimpressed with her other behaviour too? Dunno.
Also I wonder what her bio dad Ray thinks of all of this. I don't think he was as 'absent' as KP made out over the years.