My speckled Sussex has had a large crop for probably 2 weeks, and with this being my first time with chickens, I thought she just liked to gorge herself on food. She kept doing the weird head/neck movements and I thought she was just trying to get her food to go down (I was wrong). So I finally realized there was a problem, so I isolated her and took away her feed and gave her water. She has become increasingly weak. I brought her to the vet yesterday and the guy didn't even tell me what was wrong with her. He sucked out her crop and told me that there was some grass in there that he couldn't get out. Here's the problem though. She's never been outside, so clearly it's not grass. She's about 11 weeks old and is living in the unfinished coop right now. I have noticed that right when I got her, she has been obsessed with eating any loose feathers that are floating around. So my theory is that this "grass ball" is really a "feather ball" and she can't pass it. She just started curling her toes in and sitting on her hocks last night and has a really hard time standing on her own. If I don't do something right now, I don't think she's gonna make it. Did she suddenly develop Marek's Disease? Please help!