I didn't check her. At the time I didn't realize how dangerous they could be. I didn't notice them on other birds until 2-3 days after her death. The worst part is, I had an inkling in the back of my mind on a couple of occasions leading up to her death when I noticed the birds were preening a lot. I was asking myself, did they always preen this much? I just didn't explore the question further, and I should have. Lesson learned.
That's wonderful your vet has a backyard flock. I had tried to take my girl to a vet who said she had chickens of her own, but hadn't seen a chicken in her office before. By the end of the visit it was painfully clear she knew very little about chickens (which I guess is saying a lot given my admission over losing a bird to lice). I believe she was very hands off with her own flock. Even in my own field of work, I'm licensed to practice a large scope of treatment, but I only specialize with certain things, so there's a lot I could do that I am not knowledgeable enough to do, vets are the same way.