Today I gave my Rhode Island Red a bath to remove a clump of poo from her feathers. Her underbelly felt swollen and hot. Otherwise, I haven't noticed any other symptoms or unusual behavior. I mixed some tetracycline and oregano oil into fresh water for her today, and will repeat with fresh water for the next week. I also will use some Ropapoultry Complete in another waterer, too. Anything else I should try for her? Fyi she is an old chicken, probably 3-4 and hasnt laid an egg in a year. But otherwise seems healthy and active. Does she need to go to the vet?