I was treating 4 of my chickens when the weather turned cold for a respiratory infection. They were wheezing, nasal discharge. I gave them antibiotics x 7 days 2 times a day & had them separated in my garage to be cared for. They all got well & returned to the flock within a week. We had two real cold nights & now one of them has started with the nasal discharge & lethargy again today. I have brought her inside. ?do I re start her on the antibiotics again? I'm so worried about her. Any suggestions? Thank you