Dottie is 20 weeks old, not laying yet. 4 days ago I noticed her limping, almost falling over when she tries to walk, and her wing drooping. She eats and drinks. I don't see any bumps or lesions. I've been reading about Marek's but she doesn't have any other symptoms. She moves her neck, her eyes look normal, no heavy breathing. I did separate her today because some of the other girls were picking on her. (They hadn't up until this morning). I'm leaning towards an injury but I'm scared it may be Marek's and I didn't separate her until today. None of my other girls are showing any symptoms. I also don't know if I should keep her indoors or would she be okay over night in a dog crate in the run? I live in New Jersey and it is about 40 degrees here at night right now. How can you tell the difference between an injury and Marek's?