Hi, I have six chickens all fine except one who stopped laying about six weeks ago. I thought she was just having some time off as they had all layed through the winter even in the snow days! She was the most difficult to get near so I thought as she ran away from me fast she's probably ok. In the last week she got a dirty bottom. When I cleaned her with warm water and paper towel I noticed her vent was very clean, it was just on her feathers. The next night I held her over some warm water thinking it may be related to her not laying and maybe bunged up. I am also 1/2 way through worming them all just in case although cant see anything wrong with any of their poop. I have also given her gratted apple, yoghurt. She is only 1 year old, does any of this sound ok, her tail is up, she is rather wary of me now so doesnt rush up like the others. Her eyes are clear, she fights for peas if offered. I did find a shellless egg in the shed today. They have oyster shells. Please any advise. Thank you.