If you get any helpful advice, please feel free to pass it along to me. I feel like I am in that same boat with you. I have a 15 year old girl that I am about to strangle. She has tested the waters so many times. She gets better (for awhile) and then worse again and each time it gets worse with her. I, like you, have tried everything I could think of. I have done 'positve re-enforcement', tried sitting down and calmly talking to her, tried grounding, even busting her butt. NOTHING works. I guess what I am trying to say, is I want you to know you are not alone there are other parents out there with the same problems.