I have a three year old Welsummer hen. For the last couple of weeks I thought I noticed her limping on one leg. Yesterday I noticed her standing on one leg and the leg she was holding up was shaking. She is now more noticeably limping on that leg. I know Marek's is a concern, but my understanding was that older birds should be less likely to be afflicted. It also doesn't seem to have the fast progression that is typically seen in Marek's. So far the only other thing that may be occurring is weight loss. I noticed a week ago that she seems smaller, but I haven't been weighing her so that may only be in my head. We did pick her up and there are no visible signs of injury to her foot or leg. The rest of the flock seems super healthy as well. Anyone have any ideas? Any help or advice would be appreciated!