One of my 3 year old sex-linked hens has been puffed out the last several weeks, but seeming to eat move around, comes in and out with the rest of the chickens. Now she really is just standing still... opening and closing her mouth as if gasping but not really gasping or wheezing. Gaping like a fish opens and closes its mouth. Her lower abdomen seems distended. Of the other 12 chickens, 11 are great and healthy. One we lost to our own negligence -- a poopy butt got infected and abscessed and we culled her a couple days ago... she also was just standing around puffed out. This one's hind end looks great, just her whole lower abdomen feels distended. She just ate a little slug I held out to her. she drinks a little water. We've had her inside 24 hours, and now half an hour in a warm bath without results.. any other ideas?