FWIW, nothing on any of the IQ tests is pathognomonic (clearly indicating or ruling out the diagnosis) for ADHD. The pattern you've got there of super-fast speed on easy tasks and nothing else being able to keep up is precisely what you're seeing in real life -- this is a kid who leaps first and then looks later, or forgets to look at all because she's already leapt on to the next and the next and the next.
Obviously, I haven't seen your kid and would never presume to make a diagnosis over the internet. But I would say that I've seen other kids with pretty clear ADHD who had this kind of profile. Buzz buzz buzz whizz pop! I agree with Dottie, too, that sometimes what's going on is that the kid is doing less well on other tasks precisely because they're not slowing down to actually see what's being required.
