My polish hen was breathing through her mouth and had discharge, which I noticed when she shook her head and all the stuff was flying out of her nose and mouth, the discharge was thick, a bit white and had hints of yellow. She didn't free range as much as my other two roosters did, spent a lot of time standing still and breathing hard. I set up an "nursing nest" for her. But when I was going to put her in she didn't have anymore discharge and is breathing fine. Should I be worried? Should I isolate her anyway?