I have two hens and a rooster. One of my hens started having trouble walking yesterday. She is worse today. She try's to get up to eat (only watermelon and strawberries) she won't eat any pelleted food. I looked it up sounds like it could be Marek's disease? She try's to walk then flops over with her wings spread out. I'm am new to having chickens. Not sure if my other two can catch whatever she has? Not too sure what to do with her but I don't want her to be hurting. Please help!