I've heard that you should try falling on the ground and they will get curious to see what is wrong and come to check on you. Either that or running in the opposite direction. I know that running after Hannah does NOT work. I have to just sit and wait for her to come to me. Once she sees I am not following her, she won't go very far. It is the hardest thing to do, but it actually works with her. The sit and wait takes a fraction of the time to get her back than if I am chasing after her.