Hi, I've got a 1.5 year old Barred Rock with a weird issue. Last night, I looked in on them after dark, and she was on the roost, with the innards of an egg in the shaving beneath her, but there was no shell to be seen. I brought her inside, checked to make sure no shell bits were stuck in her vent (there weren't), and then cleaned the area with a mild vinegar solution. I put her back with the others, figuring keeping her apart might stress her out. This morning she looked and acted fine. Tonight, I looked in on them again, and she seemed to have another bit of egg under her, though less than yesterday. I give them calcium chips to pick at, as well as yogurt every morning, and ACV in the water. She's in there with 5 other chickens. Any ideas what this could be?