I really don't think Jade has tried to better herself. She is selling every sort if shite to the papers about how she wants to "chin Kate". Yeah, that really trying hard.
I don't give a toss what her family situation is like. Bullying is never right, and it can never be excused. Eejay, don't be so ridiculous. Jonny was not a bully in that house. The only bullies I saw when watching it were the ones on the rich side those 2 weeks that Sophie and Jonny were on the poor side. Jonny wasn't really bullied, just bitched at, but Sophie was, and Jade did not deserve to win. Even if she has turned over a new leaf, which I find hard to believe, that doesn't excuse her behaviour. There's a difference between speaking your mind, and being a complete and utter bitch. Tim and Adele were no better, but those two weeks Jade's clique was in control, and she definitely know it and used her power to her full potential. I remember when Sophie said that she'd be up that week, and Jade snapped at her "You don't know Sophie blah blah blah" it was just horrible.
I'm not saying Jade is evil or anything, but she can be a nasty person when she wants to be. She's a Gemini as well - might explain it.