I'm sorry to hear about what happened to your daughter and your neice.
I wanted to let you know that your daughter sounds a lot like my little sister. At about the age that your daughter is, my parents started having a lot of problems with her (she has ADHD too). She has always had trouble in school, but not real behavioral issues, and she started lashing out at home A LOT. This corresponded with a change in her medicines too. After they got her medicines back in order, she got much better. The hormones were playing a big role too and unfortunately, those don't go away!
You posted a while ago about how people used to not want your daughter to come spend the night because, they couldn't handle her, I cannot tell you how much that sounds like my lil sis! She was a crazy kid for sure, but then again, I was too, I think that a lot of that is probably immaturity, and I say that because I was one of those "too smart for their own britches know it alls" when I was that age too, but I grew out of it. My sister is now almost eighteen and about to go to college next year, she's still a bit fiesty at times, but she's come a long way. . . . I promise, there is a light at the end of the tunnel!