Being an outside cat (with no vaccinations??) I'd think an upper respiratory infection. If that was the case then nothing but good old antibiotics are going to clear that up. However if it doesn't have vaccinations it could have some kitty disease. Either it would need to be caught and taken to the vet, or at least call your vet to see if they have any suggestions of something in the food, but I guess that would mean you'd have to know exactly which bowl she eats out of, and make sure only she ate it with no leftovers. See what your vet thinks.
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