I have eight 12 week old Swedish Flower hens and one is clearly not developing at the same rate. The others have big red combs and wattles, and she barely has a tan comb. She is much smaller too. She also has not been able to walk for the last 7-10 days. I have had her separated for the last week, but when I give her a chance to walk around she is unable to support herself and falls. She does sometimes sit up on her haunches. She has a good appetite and is drinking too. I have read everything on this board about Mareks's because of her paralysis, but it is not one sided, and I guess I don't want to believe that is what it could be. Would I also see the lack of physical development with Marek's? I have given her vitamins for over a week, and haven't seen any improvement. Also, I don't see an injury that I can identify. I also gave her Wazine, in case she had worms. I'm not sure what to think, and I certainly would appreciate any advice you might have for me. The first photo below is her, and the second is of two others who are clearly more developed. Thank you!