I have a hen that displayed those very same symptoms last winter so i immediately pulled her out of the flock and put her in quarentine. I put terramycin eye ointment that was used for a cat with allergies around her eye and cleaned it out every day several times a day. She recovered nicely but i don't believe she had CRD she never coughed or sneezed and since she has had it we have hatched chicks as well as picked up a few more here and there and none have ever gotten sick. One difference with my hen rory is that she had gotten beat up by an aggressive roo and he bit her eyelid which im guessing caused an infection. looked like someone poured dish soap in her eye. For awhile i was afraid she wasn't gonna make it but shes happy, healthy, and back out with the rest of the flock living her chicken life to the fullest. I really hope yours has the same outcome.