I wish I knew....we have this problem here. DD plays very well with 6 year olds and they will play with her, but typically not when there are a bunch of them, and i am not sure if they would if we invited them over to play. You know I remember feeling very lonely as a child for this same reason. I really made friends with adults and this lasted all my life. I worry about this for my DD too.

DD6- DYS
Homeschooling on a remote island at the edge of the world.