Please help! My chicken is not acting right. She has slowly progressed to just laying in the grass. She was eating and drinking well but now barely doing either. Her vent and area right below it is very edematous, red and softball sized. We are able to get some poop out. White colored, no other chickens in the flock are sick. She is about 5 months old. Haven't gotten any eggs yet but starting acting like she wanted to lay with the submissive squat. I attached a pic We have lubed her vent and soaked her and started her with some Sav-a-chick. I don't feel like it's an illlness but should I start corrid? Please help!