I have a friend with a chick that isn't acting right. It is a 2-month old white leghorn pullet. I do not know how much she weighs but she is the smallest of all my 8 chicks. It has been flopping on its right side when it tries to walk and my friend has caught her with her right eye twitching before. She is also unable to roost in her brooder with her other siblings. This has been happening for about a month now. No other chicks have been acting this way. You can't see anything wrong with her, no bleeding or anything like that. I have no idea what might of caused this. My friend has not done anything yet. Could this possibly be Marek's? If so, how should my friend treat this?