My Black Australorp, Ebonnee, has developed an exposed vent. It is very red, large (about the size of a small egg). Her bottom is clean. I am afraid she might be impacted. She is drinking and eating with no problem. It is not bothering her in the nest or on the roost. What can I do to correct this. All my chicken books are on loan to friends who are newbies, so I don't have my references.