How old is this hen? Have you checked her for being egg bound if she is old enough to lay?
Can you do pictures? If she is laying everday, as you said, she isn't bound and it's something else. She is still young enough to be trying to get it all straight, but to be on the safe side, if you could, try to get a picture or two of the discharge. Have you ever treated for coccidiosis? Wormed? there quite a few things that could cause these symptoms...not sure what you've done, so don't know how to reply.
If your birds have hit the gorund, been able to run in the grass or pen, then yes, they have been exposed to all kinds of stuff. The trick is trying to figure out what the problem could be. If a treatment for coccidiosis using Corid doesn't work, I switch to Di-Methox after a week of probiotics. If this doesn't work...I go to the Safeguard after another week of probiotics and vitamins. To me, I second guess myself all the time....I normally treat for the cocci first because 9 out of 10, that's what it is, even if it doesn't show all of the symptoms usually seen. If still seeing symptoms after the sulpha, I go to the wormer just in case. You have to look at all of the symptoms as a whole and separately to figure it out.
