S.C.
When you take her things away, how does she get them back? Does she have to earn them back or do you just give them back to her. I would make her earn them back. If she loses TV time, then she has to do 4 tasks or behaviors to earn that time back.
I don't, as a rule, watch Dr. Phil but I happened to catch one really good episode a long time ago. He said that you have to find your child's currency. So, for her, taking away those things might not be a big deal. You have to find what is going to work for her. It's going to take some trial and error.
I really like what the previous poster had to say about talking to her. You might be surprised at what she tells you. The car is an excellent place to talk because, as weird as it sounds, it's almost easier when they don't have to look at you. Just make sure to keep your tone neutral and don't get angry. Make sure that you validate her feelings, even if you think they're silly.