I have a child with AS. He was in traditional schools up until grade 7, when he was finally diagnosed. Being in daycare, preschool, and institutional school as well as forced activities (soccer, scouting) did little to make him more social. When we pulled him out to homeschool, suddenly he had the energy to form real relationships with a small handful of kids. It seems counter intuitive, but taking him away from the large groups was the best thing ever for his social development.
I think it may be difficult for a child with AS to fit in well with kids who are now going to be significantly older. If it's just about academics, that's one thing, but expecting her to make friends with kids who are going to be much more socially savvy is a bit unrealistic. If kids with AS are a few years behind socially, then putting them with kids who are older will only exacerbate the differences. I don't mean to reject your proposal outright, but it may be best to consider other sources for friendship, such as structured small group activities.
best wishes-
