I'm not too sure on this one, but my Dd is 4 and she too follows other kids around and copies them until they either play with her or ask her to stop! We talk a lot about other ways to make friends and how she feels when they don't want to play, the reasons they might not want to play, etc. I think when she gets to school next year it might settle a bit, but at the moment I think it's still fairly normal behaviour. She is also really bossy, and always has to win, not particularly endearing traits when trying to make friends, but I keep reminding myself that she is a cool, funny happy normal kid who is being herself and I love her to bits so I am sure others will as well if that makes any sense??