Our Barred Rock has been in perfect healthy and then suddenly yesterday she is lethargic and has white runny poop. She is just standing with her eyes closed. She looks miserable. She also looks puffed up....like she is bigger. Our hens haven't started laying yet but should start any day. Could her first egg be impacted?? All other 5 hens are fine. Her vent is red and swollen and pulsating. She has not had any food or water since I let her out of the coop and we are super worried.