Some parental advice from all the lovely parentals? Non parentals also welcome :D

[Losty]

There is no known or demonstrable academic advantage to skipping a grade.  There are, however, known and demonstrable disadvantages that range from social issues to the reduced likelihood of things like sports scholarships.  I'd say that you might want to approach the question under the assumption that there is no academic gain to be had, see what it looks like when the metrics are different.

I think the advantage would be that my daughter graduated to a 5th grade reading level yesterday and she is slowly growing to hate school because "it's sooo boring". The academic disadvantage to being in a grade well under your level is that you get frustrated and discouraged. I want her to be somewhere where she can actually learn new things.