Any disease may have a secondary infection or complication. Make sure her room has good air circulation. There is no common cold in chickens. Here is a list with symptoms of various common respiratory diseases:
https://edis.ifas.ufl.edu/publication/PS044
If chickens get a virus, and there are several possible ones, such as infectious bronchitis, ILT, and others, it will last 4-6 weeks. Antibiotics do not shorten the length of time, and it will run its course. Sometimes an antibiotic might help if they get a secondary bacterial infection. I would...
Is enroxil in the same as enrofloxacin or baytril?That can treat a number of bacterial infections, but she could have a chicken virus such as infectious bronchitis or others. Viruses would need to run their course over weeks to a month or so. What have been all of the symptoms you have seen? Are...