I bought this chicken with 8 others a month ago. I didn't notice her back was messed up till the next day. I've seen her go in the laying box twice but didn't lay an egg either time. Her tail stays pointed down and her back has a hump towards her tail. Has anyone had personal experience with this?
and Welcome To BYC! You've gotten some good advice above. How old is the hen, is she just starting to lay or had she been before you got her? If a chicken has a damaged tail bone/ligaments etc, sometimes they seem to do something like that, there have been a couple of pictures on BYC where hens had that after dog attacks etc, would think sometimes it just happens also. What happens with the hen seems to depend on what is damaged internally.