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Thank you for trying to help this barn kitty. My name is Rebecca. I am a veterinarian and will do my best to help.
Many of these sinus infections (yes, cats have sinuses) are viral and have to run a course, just like when we get a cold. If it has been going on for awhile, you could try getting some Terramycin online or from a feed store, and putting it in her eyes once to twice daily. You can put children's nose drops, 1 drop once to twice daily, in her nose. Little Noses is safe to use in cats.
If it continues, she may have a bacterial infection and may need antibiotics. You would have to take her to a veterinarian to get antibiotics for her.
Let me know how she is doing and what other questions you have. Rebecca
I hope you were able to see my answer. Can I help with anything else? How is she doing?