Why are some kids like this..?

I would leave her be and not give her any advice for awhile. If she's going to be this rude to you and being generally stupid (seriously not wanting to graduate high school because you did? That makes no sense at all. Along with some of the other examples of what she said). She's on her own and you should let her make her own mistakes. Hopefully when she is older she will realize how dumb she was acting and maybe wouldn't act like this anymore. Until then don't offer any advice unless she ask for it, even if you are only trying to help her.