That sounds a lot like my younger dd as well. She's not interested in reading, reads slowly but with great comprehension, doesn't care about challenge, and attends school for the social aspect. Mine has ADD and is probably HG. What we saw in my dd's WISC was avg WM and PS and 99th+ PR and VC.
Mine, too, is well behaved in school and doesn't call attention to herself so teachers tend not to see atypical needs. We were in a similar situation with math in 5th grade with dd. Her individual achievement scores on the WIAT put her math composite at the 98th percentile. She's twice taken the EXPLORE and scored well above the cut-point for GT id in math (better than nearly 80% of 8th graders when she was 10 for instance). She wasn't complaining but she also wasn't having to work to do well and b/c her MAPS scores were all over the place and her CogAT also wasn't high enough on the quantitative portion, her school wanted to place her in the std math class with everyone from kids who were well below grade level to kids who just missed the cut for the accelerated class (about 1/3 of the school was in the accelerated class).
I wasn't good with her being in that grouping especially b/c it seemed likely that anyone else who was functioning at a similar point w/out a disability was in a much more accelerated class. We pushed. Dd subject accelerated in math that year and it was a struggle due to constant mistakes, attention, etc. By the end of the year she had an A in the class, though, and passed all of the tests the district gave to continue with subject acceleration in middle school. She's doing well in the 7th grade math class this year (she's a 6th grader).
I might be pushing for more in math at least in your situation. I wouldn't seek full grade acceleration or anything more for my dd at this point (or likely later) b/c her ADD does stand in the way of her performing highly enough to ask for something like that. I don't want to throw her into a situation where she is truly struggling to do well, but I do want her somewhere where she has to learn the value of hard work whether she wants it or not.
