In her autobiography, Katie states that she pretty much became famous overnight at 18. She knew nobody in the industry and was betrayed and taken advantage of by many.
She was pretty and cashed in on it. She made a fortune. However, she didn't make many friends along the way.
If she'd met a decent man, I believe she'd have turned out alright. However, she only ever seemed to get with men who were a bad match for her. I don't think she's a lever been with any bloke that was a good match sadly.
That said, I can't defend her animal abuse, partner abuse, and so on. She and only she is responsible for that.