I have a black sex link who is about 8 mths old now. Stopped laying. Other hens have isolated her. So, I isolated her too. Then noticed she wasn't laying. And last night as we were hooking up the heater in there house it sneezed. I've been told to use apple cider vinegar in their (all of them) water. Will this help? How long do I wait for it to get better or not?