How's she doing? I'm dealing with a similar thing, one of my 5 month old olive eggers sits like that a lot but is walking fine. One of her sisters was attacked by the other hens last weekend and died a couple hours later, but I am sure something was wrong with her that caused them to attack her (and be able to catch her). I also have a serama rooster that went lame (right leg) about 2 months ago and an Ameraucana hen in his pen that has been lame in the left leg for about 8 months. I did lose a serama pullet in that pen last fall and was sure it was mereks the way it presented and progressed (she died after about 1 1/2 months), but now I'm not sure. At first I thought the other birds had mereks but it hasn't progressed and the roosters actually gotten better. I have been treating with vitamins and high protein food, with no change. Now I think I'm dealing with MYCOPLASMA SYNOVIAE. I am starting tylan 200 and will see what happens.