I have never used salt water to clean eyes. I would have thought that would make them sting?
It certainly sounds as if something has caused inflammation and she needs to see a vet. Eyes are not something you should delay having checked.
The panting may be because of the pain. She may even be running a bit of a high temperature.
A well known home remedy for canine sore eyes is lukewarm tea ( without milk or sugar ) and that will sometimes help minor irritations or soothe the eye while you wait for a vet appointment, but red sore eyes do need to be properly checked.
Cavaliers......Tommy Tuppence 2000-2012 and a half share of Faith.
Japanese Chins.... Dandy, Benny, Bridgette and Hana.