I have a 20 week old Barr rock who is acting strange. Over the last few weeks she has become quite the loner. Doesnt come running like my other girls. I thought maybe she was death. But now she is going in the coop at night before the rest of the hens and last to come out of the coop. Her tail feathers are down not up like the rest of the hens. She is drinking lots of water but I havent seen her eat food. I even put some meal worm treats in my hand and she wouldnt eat any. I have been getting some small eggs but not sure which hens is laying them. I am going on vacation tomorrow and would like some advice.