My one hen is acting different. She was sitting for over an hour until she finally laid an egg (3 months later then the others) and she seems to separate herself from the others and she never did that before. She is also not as "peppy" as she used to be. Its been a week now. Last week it seemed as though her neck feathers were missing but they are grown in now. I'm not sure if she is sick or the others are bullying her. Everyone on here is always so helpful and I am a new chicken mommy so any advise would be helpful to me.