that is terrible
i am going to be very careful how i say this, but i really wonder about kids like that, they are so mean, i would find out who they are and turn them in to someone either police or humane soc. let the girl know next door, ask her about them. i think i would try the leash thing also, i walk my blackie, because these clowns might come back and try it again and manage to catch her. good luck with her and hope she keeps out of harms way.