So much depends on a kid's personality and the personality of the school. Our DS is the oldest kid in his grade; he missed the cut-off by only a few days. But the private K options were unacceptable to us and I kinda wanted another year of him at home and at a pre-school he loved. Even though he was waaaay ahead of anyone else in the K class academically, he was also more mature, had more impulse control, and was better able to advocate for himself. He is in 7th now, has great confidence and is really a natural leader, has no trouble with bullies, and gets all his accomdations by negotiating for them himself.
If we had gone the early K route, I would have missed that extra year with him at home before he went to school and for him, I think being older and more mature has made the advocacy and negotiating for differentiation easier.
I think a lot of the decision may have to do, not with what they are able to do academically, but how much are they ready for the school atomosphere. Since she is only 3 now,you have some time to see how it all pans out.
