Sometimes some animals just get infections. I agree with everyone too. Terramycin eye ointment wonderful but triple antibiotic ointment works ok in eye too. The major difference between eye ointment and topical is sterility. I definitely would give tylan by mouth. I strongly believe in that. I wouldn't cull her. I would try to get her well. Everyone deserves a chance. Whenever a chicken that I have is sick and i doctor it and it isn't eating I drop tube down there throat into their crop and fill them up with nutrition. Ensure, baby formula anything really is better than nothing. You can feel the tube in their crop to know you are giving it to them in right place. I also give them 1/2 of b complex vitamin and vitamin e. Everything helps.