Deleting photos posted by sitter of my dog?

We booked a sitter over the summer who despite us telling her multiple times that our dog needed to be in a kennel in foreign places decided to keep him out of the kennel for her workday. He got into something and became sick and she sent us pictures of his poop. We would prefer those not represent our dog especially since we specifically asked her to keep him in his kennel if she were to be gone for longer than a few minutes because he has major separation anxiety. Is there a way to delete these photos?