Photos would be helpful.Can I ask what happened to your hen? @shakin_the_trees
I have a hen acting exactly the way you described. Supposedly broody, jiggle stomach, swollen/red areas, etc.
@Wyorp Rock @Eggcessive @MysteryChicken @azygous @EggSighted4Life, are you able to help us?
Jiggle stomach doesn't sounds like the symptom of water belly (Ascites). Fluid in the abdomen would be tight light a drum, not jiggly.
What's swollen/red? The vent, her keel, abdomen below the vent between her legs?
What's supposedly broody? Is she broody or lethargic?