Do you see any bubbles or foam in her eye? Is there any nasal drainage, chest rattles, bad odor, or cough? Facial swelling can be from a respiratory disease such as MG or coryza, but may also be a result of a sting, or peckwound. Sometimes they can get an eye infection from a foreign body such as a seed pod or piece of dirt. Rinse her eye with saline, and apply some antibiotic ointment such as Teramycin ointment from the feed store or plain neosporin ointment twice a day. Make sure that she drinks enough water.
If you think she has a possibly respiratory infection, I would get some Tylan50 injectable from the feed store. Dosage is 1/4 ml per pound of weight given 2-3 times daily for 5 days. Remove the needle from the syringe, and give the medicine orally, a drop or two at a time, so she doesn’t choke. You could also get Tylan powder to give in the water, but it has to come from a vet with a prescription.