I have been on vacation and came back to this! This hen has had a 'pasty bottom' for a couple weeks now but I figured it would work itself out. Her comb is noticeably pale and she seems lighter than normal. Her vent is all crusty and it looks like clear liquid is secreting from it (her whole underside and feathers are wet). The two bones under her vent are also very noticeable. I have no idea what to do or what is going on. Some other info: I now have her isolated and plan to give her some fresh yogurt. She has been on layer grain and free choice grit and oyster shells. She seems to have an appetite (happy to receive scratch) but looks weaker than normal. Thank you!