L.K.
Sometimes I think girls are getting hormonal earlier and earlier these days. Don't know if it's from the hormones in milk and meat or what. At any rate, if you are looking for a good book that deals with girls and all the changes their body is going through,including mood swings, my girls, now 15 and 12, emjoyed the Care and Keeping of You-I've seen it at Barnes and Noble. It's in cartoon format and I got it for my girls when they were 9 or 10.
This probably isn't exactly what you're looking for but it might be a help.
I have a daughter that keeps all her emotions bottled up at school, the perfect student, and comes home with what I call the big build up. She is brutal to her siblings and we are constantly trying to work on more construcktive ways for her to handle her emotions. I have a girls scout troop that meets after school and my coleader and I talk about this all the time. These girls get to the meeting and even the quiet little ones are bursting with gabbiness. I wonder if your daughter might have some of this going on as well. Good Luck and perhaps with the other advice you can piece together some different approaches.
LaurieK