Hello M.. My oldest daughter is only 8, but my son just turned 12 yesterday and he goes through this big time. I punish him very effectively. Time outs work great for him, 12 min of sitting on the couch, no tv, no talking, no moving, no closing of the eyes, and no laying down. When I first tried I it thought I was just wasting my time, but I didn't want to fight with him (he was being mean to his little sisters). The other punishment I use is loss of electronics; no video games, no tv, no computer, no MP3 player; absolutly nothing for the rest of the day. His electronics is what he lives for and taking them away for the rest of the day (even if it is only three hours) is a killer for him. I am sure your daughter has something that she would just 'die' if she didn't have for a day, I would find out what that was and start taking that away for the day when she misbehaives (no how sevire the infraction is dictates how long the item is taken away). What ever it is you decide to do, I would definatly NOT ignore the bahavior, it will be worse when she is actually a teen. My SIL is her teens best friend and they share everthing about her school and friend issues (doesn't eliminate the mood swings or the rolling of the eyes) but it has helped my SIL understand more of what is going on in her daughter's social life and circles and expalins alot of the mood swings. Seems like now might be a good time for you and your daughter to start to form that bond with your daughter knowing upfront that you can be her best friend, but you will always be her mother and the one who is in charge. Best of luck!