I'm not sure how LGD's are supposed to act toward people. I need to do more research. They're there mostly to guard the livestock from predators. And my understanding is that attacking is supposed to be their last option. First, they make threatening displays that convince all but the most foolhardy to skidaddle. Was the girl foolhardy?

My guess is that biting a person who has merely entered their area isn't what they're supposed to do, unless the person has ignored some pretty significant warnings to leave.