Thank you for your help. That makes sense to me as to why the others are all fine. She was drinking a lot and had green diarrhea. I'll still get a necropsy done on her to know for sure. I have to know if there was anything I could have done differently to save her or not.
She was just under a year old. She suddenly started to isolate herself from the other chickens. She was losing weight and had a pasty butt. So I gave her a bath and dried her off. We went to the vet and they couldn't figure out what's wrong so they gave us antibiotics and pain reliever for her...
