My two year old white leg horn Pearl has been droopy for the last few days. Her back side is a bit bare and her breast looks really extended. Her huge red comb is hanging and when I picked her up liquid came out of her beak. She is a mess. I have checked for lice or any indication of something wrong. Found nothing amis. The other 10 hens are fine. She is drinking water and eating a bit. Any ideas? Thank you , because it seems she is going down fast.