How to deal with a rebellious teenager?

I'm sorry to say. But there isn't much you can do. I know it may hurt but she has to learn from her mistakes. The best you can do is groundher, take things off her, stop her priveledges and hope for the best. When she starts behaving again then slowly give her these back. That's what my parents did with my brother. It actually worked.

Maybe you could not be so serious, just ask her why she thinks she's right. Tell her you disagree, that she could get into trouble, look bad, be disappointed in herself, etc. Tell her you think she is smarter than that, to do whatever you think is a wrong thing to be doing. Teens can be difficult. But, when you try to control them - that does not encourage independence and assertiveness, just anger. They do have to make mistakes, learn from them, yes.

Well i'm 17 and i have never had to be told that what i was doing was wrong. But my brother is 13 and he does. My parents method has always worked but i see your point. I suggest trying your approach first. then if that doesn't work try my parents approach.