Chicken standing hunched with butt drooped down, but not egg bound?

[Aloeverasaurus]

I can’t figure out what’s wrong with this hen. She’s an icelandic, and since snow started a month ago she’s been acting very lethargic and unhappy. Sitting in the corner of the coop, slow to exit in the morning, and yesterday she even tumbled out. I haven’t seen her shivering, and she doesn’t seem much thinner than my other hen, but she isn’t as interested in food or water as rhe other two. Her poops look fine, no blood and not overly liquidy. We did change their food to crumbs right before winter started because my dad messed up and got the wrong bag and we didn’t want to waste it. But it’s still the same brand, same type of food. I’m treating her with corid as a precaution, because we did have a problem with coccidiosis when the chickens were younger because we got a few from a not-stellar place. I just don’t know what’s wrong, and I don’t know how to help her.

 

[Aloeverasaurus]

Also, i completely forgot to add, she seems generally a little uncoordinated, and will tilt to side a little every now and then. She still walks with her back end pointed down, and I didn’t feel any stuck eggs.

 

[Eggcessive]

How old is she? Has she laid eggs recently? Does she have any problem with her crop emptying by first thing in the morning, or any swelling below her vent and belly? Hens who suffer from internal laying and egg yolk peritonitis can look this way. If she is having trouble laying an egg, you may want to give her a human calcium citrate with vitamin D tablet, or a Tums orally. What do her poops look like? Pictures are welcome.