Update on my lumpy hen: I kept her in the mudroom the last few days to give her a chance to relax and observe her behavior. Her poop still looks normal, eyes are bright, and she is still eating well. Thursday she did not lay, Friday she laid a soft shelled egg, and yesterday another small, but normal looking one. This morning I put her back out in the coop/run and she went about her business as usual with the other hens. Her bulge is the same size as it was, and is warm, but not really more than the rest of her body feels.
Kathy, You asked if I had any human antibiotics. What would be the reason for them vs. animal antibiotics? I think I have some doxycycline that should still be in date, but need to find the bottle. The vet is not really an option for us.
If it makes sense to try, I can separate her in the coop in a crate and give her antibiotics to see if it does anything.