Wow, that really does change things! I would agree that if she was capable of ignoring him with only 2 other kids in the class then there's nothing for him to gain from it. And, really, how much of a peer group is 2 other kids?

Is there another co-op near you? Ours offers a huge variety of classes and splits the kids up into 4 groups (3-5yo, though they let DD2 participate, 6-11yo, young teens and older teens- the teen groups seem more fluid than the younger kids). I hope you guys can find a better fit!