I have a middle aged Cuckoo Marans, named Willis, who seems to have become constipated recently. Over the last few days, she keeps standing still and flaring her feathers around the vent, but she is unable to actually pass anything. She's also been doing the "emu sit", sitting down with her upper body reared up so her legs are exposed, something I've never seen her do before. She's still eating. I believe she's still a layer, but I'm not sure. She had Marek's Disease a few years ago, and became extremely sick but survived. Since then, she's been partially blind and less active. Is she in any danger? If so, what can I do? Also, she's molting. Does that have anything to do with it? This is how she's been sitting: Like that, with her legs out. Never seen any of my other hens do that. Thanks if you can give any advice.