I am not a vet. I try to not use medicines unnecessarily. I would probably use the Aqua Zole if you think it is canker, and continue the enrofloxacin 10% to finish the 5 days. If you then seeing improvement, and are getting some pus out of the eye or sinus, I might hold off on the...
The sulfadimethoxine is a bit hard to find and is sold out in most online places, but this one:
https://www.ladygouldianfinch.com/medicox.aspx
Dosage is on the label.
The enrofloxacin you are using might work too against coryza. I am not sure.
The enrofloxacin 10% that you may be giving could help if she has coryza. You can presently get some of the antibiotics online for pigeons. Of course none plus the enrofloxacin are appproved for chickens, and a long egg withdrawal should be done. Here is where to find metronidazole for fish or...
Both canker and the respiratory disease infectious coryza can have a bad odor. Canker is best treated with metronidazole. Coryza is treated with sulfadimethoxine or other sulfa antibiotics. Is there any way of seeing a vet in your area where they could test for those diseases? Some people do...
Do you have any pictures? It sounds as though she has a chronic respiratory disease or canker (trichomonas) infection. The latter is a protozoan disease carried by pigeons, and causes cheesy lesions in the beak and throat that smell rotten. Do you notice a bad odor? What antibiotic are you...