Here is the synopsis!!
A friend of our's came over to look at Butter. (Her name is Mrs. Gibson and she used to be a vet, though now grooms and boards dogs.) Mrs. Gibson looked in Butter's vent, looked in her mouth, checked her wings, thighs, feet, tail, and general vent area. Her eyes were clear, and nothing wrong outside. Mrs. Gibson said that she isn't egg bound because she felt in her vent, and there was no egg at all... Butter was swollen in that area either. She was really confused until I told her what they had been eating... I recently got my hens two little small dog balls. I put some peanut butter on them and let the hens peck away! When I told Mrs. Gibson that she nodded her head. "That's it." she said. Peanut butter isn't good for chickens. Most of them are allergic to that and peanuts in general. So that is probably Butter's case-- an allergic reaction to PB... SO-- this is a warning:
DO NOT GIVE YOUR CHICKENS PEANUT BUTTER!!! THEY COULD BE ALLERGIC TO IT!!
Thanks for all your guys' inputs!