~~Just Dont Know Anymore~~

Maybe someone out there can relate or maybe someone has some suggestions. I have been having issues with my pre-teen daughter and I just don’t know what to do anymore. I have tried the spankings, punishment (taking the cell phone, iPod, and all them other little gadgets) I have even threatened to send her to live with her father. Nothing seems to be helping and she knows I will not send her to her fathers to live with her father but I think I’m going to have to call her bluff. I know when I was her age I probably went through the rebellion stage to but for some reason I don’t think I was that rebellious. I'm always asking what the problem is but she always says there isn't one but I know there has to be something that eating at her because she has changed so much over the last year or so. I miss my sweet lil' girl, I just don’t know what to do anymore.