Its the weekend so no appointments. One of her eyes opens and closes. It was suggested saline. Until I can make an appointment, how do you put drops in a cat's eye?
It could be that something is irritating her. Its difficult to know what, have you changed anything at home, polish, air freshener, washing powder, your perfume. If you cant pinpoint anything and it continues or gets worse I would take her to your vet.
Drops can be applied to the corner of the eye. Hold the eye open and quickly put a drop or two of sterile saline into the corner. I'm sure there are Youtube videos and such on how to apply drops to eyes.