I have four chickens in a first-class environment. Weeks and weeks ago, St. Clare stopped eating. We had a vet examine her. Something was stuck in her "throat". Surgery was suggested but I treated her by pipetting a bit of olive oil down her gullet and massaging it gently. Wonder of wonders, she recovered. Soon she was eating and hanging out with her three sisters...BUT she doesn't lay eggs anymore. Weeks have gone by...Recently, she seems a bit ragged. She's missing her main tail feathers. Are her sisters beating up on her. Is she okay? How can I tell? and what can I do?