It could be contagious if it is due to a respiratory disease, such as mycoplasma (MG) or coryza. If it is due to getting something in the eye or a peck wound, then ,maybe not. Does she have any nasal drainage, mucus from her beak causing frequent swallowing, rattly breathing, sneezing, or head shaking? I would clean her eye with a warm wet compress, then flush it with saline and apply some antibiotic ointment twice a day. Do you have anything like that available? Oh yes, the dermacombine sounds perfect to use after cleaning the eye. Saline is 2 tsp (9 grams) of salt in a liter of water, brought to a boil, and simmered for 15 minutes to sterilize it, then cool. Store it in clean jars. If an oral antibiotic is available such as tylosin or oxytetracycline, that can treat symptoms of MG.