My hen was doing well this morning -- walking around pecking -- normal. I was feeding the chickens a little while ago and noticed that she is sitting with her tail drooped and didn't even try to run away when I approached her. There are no injuries, but she did lay an egg that didn't have a shell. It was just a watery mess with a small yolk . Is she lacking in something ? Should we give her a antibiotic ? I really don't want her to die -- so is there someone who has experianced this before that can help quick ?