Our 15-month old RI Red has not been laying for about a week and seems to have an enlarged pouch beneath her vent. She's been active and acting normal until this morning, when she came out of the coop with a limp, and now seems unable to support her weight on her left leg. I soaked her yesterday afternoon in a solution of Poultry Protector, as a precaution against mites (she's had some crusty butt issues lately), but I'm not sure exactly what the trouble is. Any suggestions? She's eating OK and seems alert.