S.T.
it's a difficult age, and she's got a difficult situation to cope with. i really like that you encourage her to express herself and give her the tools to do so.
and i agree that if the behavior is continuing or worsening you need to find a better coping mechanism. i don't know that i agree that punishments are what she needs.
she should have chores anyway, so just piling more on her won't necessarily make a difference. although i confess to a fondness for hard labor for mouthiness. got a rock wall you need built?
taking away her phone sounds good. taking away all screeny things and having her resort to paper (or actual conversation if she calms down enough to be civil) is an appropriate response.
denying her social activities is also pretty good. i don't agree that the piece de resistance in your bag of tricks should be bed-without-dinner. that's a pretty antiquated punishment. she's not going to starve from missing a meal, but i can't think what it would teach her.
part of this is just YOU understanding that growing up occurs on a continuum. if she's always been a strong, willful person, then that's how she is and your challenge is to help her turn that power and energy into positive channels. that might involve being stern and silent when she melts down, and simply banishing her so you don't have to hear it. since she clearly DOES understand that it's unacceptable, it might take nothing more than time and more maturity for her to get a grip on expressing herself in a more wholesome fashion.
if indeed she's so out of control that you can't deal with her at all (and it doesn't sound as if this is the case- you seem to be no-drama-mama) then it's never a bad idea to get an angry kid a counselor. even if she's not that bad it really couldn't hurt. sometimes a kid just needs a dispassionate ear.
when you're in the thick of it, it does feel like a never-ending cycle, and if you've dealt with it for 11 years then it's time to bring in the big guns. but if this is a tween behavior, then it only FEELS never-ending, and the way you're handing it (sans the dinner thing) is really pretty good. opportunities to let her feelings out, a safe place to do it, and a moratorium on electronics may well be enough to help her work through it, if you can be patient and let your good parenting slowly permeate.
khairete
S.