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It sounds like she is on the upside of an upper respiratory infection. If you feel like it's improving and she is at a normal activity level and eating, you can wait to see if it passes on its own. If she is not, you need to see the vet. If the mucus from the eyes or nose is green/yellow, you need to see the vet sooner for antibiotics. Some cats recover well on their own and some do not.
Let me know if you have more questions.