Does the eye smell bad? Was she pecked in the eye, or have you ever seen a respiratory infection in another chicken before? I would try to press out any pus around the eye each day. When doing that, rinse the eye with saline, and apply Terramycin or Neosporin ointment into the eye twice a day. While doing all this look for any foreign body in the eyelids. An antibiotic, such as SMZ-TMP might be helpful.