sorry for your loss,
I would talk to the neighbor maybe she did not realize that she actually hit the bird of if she hit something else clear the air so their are no mean feelings. maybe putting up a short chain link fence by the road will help keep the chickens further away then the edge, I would be very upset that the neighbor did not stop and understand that you do realize that free ranging the birds comes with some risk of predators with 2 legged or 4 legged. hopefully you can figure out a way to keep the girls away from the edge of the road and still let them free range. hope you don't lose any more chickens.
