Over the last few weeks, I've noticed my chicken's comb turning purple. Some days it's not very noticeable and other days it is. Today it was very purple. What does this mean? I've noticed she has been drinking a lot when I let her out the last couple of days. I'm starting to wonder if maybe she's not drinking enough in her coop during the day. I recently switched to nipples about a month ago and she has been drinking, maybe she just ain't drinking enough. Also her vent is starting to get very dirty and starting to get clogged up. I'm worried and I want the best for her. What should I do and what does this sound like?