I have a 12 week old pullet who has had trouble walking since mid July. At first she got around okay with everyone, but two weeks ago I isolated her and am giving her vitamins. She's happy and eating and drinking, but will not stand or walk. When she walks she's weak and wobbly and off balance. Her poop is normal. I'm not sure what to do with her at this point. I'm worried about Mericks disease. How long do they typically survive once the symptoms of Mericks set in?