Do you live in a tropical climate with mosquitoes out now? Have you seen any fowl pox scabs around her face? Mycoplasma (MG) and coryza are 2 of the bacterial respiratory infections, and both can cause sinus swelling of the face and conjunctivitis around the eyes. Does she have a bad odor that is typical of coryza? Secondary infections can make respiratory diseases worse. Tylan is supposed to be food for MG, and can be used with Sulfadimethoxine or Sulmet to treat coryza. Both are chronic diseases that can reappear with stress, and can make carriers of the flock for life. I would want to get the bird tested to know what she has.