Is switching schools to one with a gifted class an option? DH and I were both asynchronous in the same way as your DD. He was skipped a grade, while I was put into the "gifted" class with people my age. I had a much happier school experience as a result. Coincidentally my parents were like that as well, and my mother who took honors classes with kids her aqe was a lot happier than my father who skipped a grade.