Just on principle, I'd write her a letter and ask for damages.
You probably can't get much money, but most local laws allow for 2 or 3 times the monetary value on bird and livestock loss (look up your local law) and claim any repairs that will need to be made to the fence or the coop... just a few bucks probably, but a good lesson for the kids about the law, and accountability, and maybe even small claims court.
What she said.
Sadly, it's not the dog's ~fault~. He was being true to his nature. It's the woman's fault for letting him out.
I'd just be very matter of fact and say, "This is a list of the damage(s) done by your dog."
Include the pictures.