You've received great advice above. The key to ongoing success may be to ask but not demand, insist, or belabor the point... and to help your daughter understand, if she does not get her preferred placement, that one need not catastrophize but rather may benefit by demonstrating emotional control and maturity, making the best of the situation, finding the good, emphasizing the positives, looking for what she may have in common with other children, focusing on getting through it, etc. This approach may inspire the leaders to move her to the older group after observing the children for a bit.