As another child who was labeled as gifted, this pretty much sums up my viewpoint as well. I remember getting into more than one debate with my teachers when they insisted I do things their way when I had come up with a way that suited me better and still allowed me to arrive at the correct answer. I also remember outright refusing to do more than one activity that didn’t appeal to me (especially in the mandatory speech giving class…) When I reached the age where they had advanced learning classes, I remember enjoying those more because they were more challenging. I remember particularly enjoying a section we did in 8th grade where we delved into statistical analysis, and how easy it is to manipulate statistics.
If reading is the issue, try getting her harder books. I couldn’t read well until second grade, either because I didn’t try, or because I had legitimate issues (I can’t recall). As soon as I got my hands on a abridged versions of the Hound of the Baskervilles and 20,000 Leagues Under the Sea, I became and avid reader. It wasn’t long until I was devouring the full versions. Daoyle remains one of my favorite authors to this day. Perhaps look for more advanced books for your child. By the end of second grade I was at a fifth grade level, and by the end of third I think I was around seventh. It sounds like your child is advancing even faster. If the teacher is trying to make her read something at a second grade level, or something that doesn’t interest her at all, chances are you’re going to be told that she refused to do that activity. If that’s the case, there’s a good chance she feels insulted by being told she had to read something that is, in her eyes, childish, simple and boring.
I also agree with posters who talked about boredom. I have ADHD and generally couldn’t care less about what was going on in class. Through most of Jr. High and Highschool, I spent almost every class programming games on my calculator. There’s a good chance, with an IQ of that level, that your child finds what’s going on in class to be horrifically boring, and can’t concentrate on it as a result.