If you have a trusted vet or large animal vet who would know about chickens, they might help or give you some good antibiotics for her. Antibiotics may or may not help the EYP or internal laying, but she could be ill with something else temporarily. I have ahen with a huge sack under her vent, and have been waiting for 2 years for the poor thing to let me know when she is suffering. Instead she gets around up and down the hill, eats, and hangs out with the other flock members, and can actually get up to a 3 foot roost at night. So get her to eat and drink, and think about treating symptoms. You may or may not get fluid out if you try draining her. I usually do not recommend antibiotics for chickens, but I would think about baytril or something the vet offers. With Baytril though, you cannot eat her eggs if she starts laying again.