I was one of those children who was skipped forward a year, and still not ever challenged in school. Please remember that, although your daughter is extremely smart, she needs to socialize with children her age. Putting her in a class with chidlren considerably older than her can really help her academically, but can also hurt her socially. Not always, but it could. My own son is in 6th grade, a year younger than those in his class, and attending 8th grade accelerated math. What has helped is that he has two friends who are also in 6th grade, attending the accelerated 8th grade math.