I am going out on a limb here. I have kids, and they are curious. They always want to hold the chickens. So either I gently walk up and catch one for them or tell them if they can catch it. I don't see the big deal if they are not harming them. Maybe instead of her chasing she could ask you to get one for her so she can hold and pet it? Eventually the novety will wear off. You could also show her how to feed treats to get them to come to her instead of chasing.