Can you get a photo of the Tylosin drops (the package information) along with the antibacterial product (package/name)? That way we are all on the same page.
I'm sorry that you are dealing with this. Post some photos of the one that is losing feathers too. We'll see if there's any suggestions that can be made.
She ate a full crop again before bed, and she got a dose of the medicines in the photos. We will see tomorrow if her condition improves.
Picked up some terramicin like @azygous recommended.
Baytril (enrofloxacin) would have been best like @dawg53 said, but it was the most expensive medicine in the store at $30 a bottle, it must be good at that price. I can not buy that, but they gave me other drops like @Eggcessive said for antibiotic that contain lidocaine. They were vet recommended.
She got a dose of all the medicines so hope to see some improvement. The sales person knew as much as a vet (i think he was a vet), he said to treat three days so we'll see if he improves.