Thank you for replying.
She's 1 year old.
Strong egg layer. Always hard, thick shells. she last laid egg 5 days ago. The swollen part is pretty squishy
1 year old hen
She's always been perfectly healthy. Last few days has been lethargic and having diarrhea. We noticed today that she has a swollen sack under her vent.
Sorry for gross picture. We have since cleaned her back side with warm water and soap soaks.
Anybody know what it is, or...
Hens go broody when you don’t want them to… and won’t go broody when you do.