Help!! This evening as I was checking my coop and my chickens, I discovered one of my 1 yr old RIR looking like she had just gotten caught eating an egg. Her beak was dripping with mucous. I cleaned it off with a towel and quarantined her. She did drink some water with apple cider vinegar with encouragement. I checked her an hour later and she had a small amount of mucous again. What is going on? It has been stressful lately with loud trenchers going for a few days but it couldn't be stress related, could it?