Hi, My RIR hen is almost 6 years old and has slowed WAY down in egg production. A year or so ago she had a stuck egg that we got out. She's been fine since. About 2 weeks ago, she started retaining fluid in her back end. Now both sides of her back half are swollen. There doesn't appear to be a stuck egg. She is eating, but can't jump on the roost at night, and won't jump off the roost if we put her up. What else could cause this?