You are lucky to have her and to have such a relationship with her that she will give you the meds you need without seeing the birds. I have 2 vets that will work with me that way at the office where I take my dogs.Gloria is our domestic creature vet. She specialised in fowl when she was training.
I was until recently one of two people who took fowl to her. In recent months, possibly due to Covid, a few other people have been taking their sick chickens and ducks to her.
She isn't up to date with avian veterinary practices, but she does have a good basic knowledge and has helped save the lives of a few here over the years.
There is an avian vet about an hours drive from where I live. Apparently he is not particularly good and he's very expensive. There is also a National Park avian vet who is excellent but doesn't see domestic fowl usually. I know him personally though and he has seen a couple of the chickens here as a favour in the past.
One of the reasons I take chickens and ducks to Gloria is she is incredibly fair in what she charges and in the event I don't have the money to pay her, she will happily accept and has in the past, woodwork I've done, Honey from the bees here, help at her surgery and veg and fruit grown here.
Today she charged me twenty Euros for examining Cillin, re-bandaging his leg, giving a six day course of antibiotics and loading a syringe of injectable Ivermectin for Fat Bird and Lock. I did help her out for a couple of hours as well. With an arrangement like this there is no reason why I wouldn't take a sick chicken to a vet unless I was absolutely sure of what the problem is and how to fix it. In this case I was concerned about tendon damage.