We have had our hens now for over a year. One of them had recently gotten bad diarrhea and was treating all with probiotics and apple viniger in their drinking water. Things were looking better but she took a turn for the worst and I don't believe she will pull out of it. Now she just sits on the ground and won't eat or drink. I believe its too late for her but what should I do with the other hens who appear very healthy as of now?