Hi.. so, you did both IQ and achievement tests done last year? If she has been pushed further by the school, then her achievement might be higher a year later (whenever that is), but also being careful that she is not burned out. I think if I were you I'd look into at some point restesting achievement since you already have YSP qualifying scores.

I know that some gifted kids thrive in the non-academic setting of Waldorf schools, while others just suffer there.

Can you take a tour of the school?