Great questions. We have talked to her about it--but she's not always communicative. Not sure what the "trigger" is. Something can go wrong with the tv and she'll start screaming, curing, throwing things, etc. I know sometimes other things are going on--worrying about school, being teased that day about her weight, just feeling lousy. Other times, I'm not sure what else is going on (if anything). It's also possible that the response is an attempt to get attention, just like a child will do with a tantrum. I'm not sure how much she can control things. She often seems not to try. I know it's easy for me to say--I'm not in her situation (as she often reminds me while in a rage)--but from what others have said here, she knows when she's heading in that direction and does not act to head it off. If she can do that, how do I encourage it??