Hello I'm new with chickens as of (Easter week) I just got a young adult hen off my dad and she's not anywhere near as spunky as my other hen. She's eating and drinking but she moves so slow with her tail down seems very lethargic to me, also has no feathers around her vent? I just gave her olive oil and Epsom salt by the way to see if it helps? Any ideas on what this could be? Thanks!