Do you think she needs accommodations/modifications/supports for the ADHD? If so, would the new school do that? If their feeling seems to be that she should be held back because of ADHD characteristics, rather than given supports to help her succeed, I would run the other way. DD has ADHD and is an environment right now where they accelerate (a lot) and don't seem too worried about kids being 2e. They say they will make whatever modifications are needed (cut the workload, use assistive technology, whatever)