Eyes are sensitive
I would wait and see what the vet says
You could check for dehydration on her back (pull the skin on her back gently up if it stays she is dehydrated)
It could be a scratch on the eye?
In the pic it doesn't look pink or inflated (some times a picture doesn't show well)
Does she seem to be rubbing it?
Make a list of anything that she's doing out of the ordinary to take with you to the vet
Sneezing, Eye rubbing, not opening it the whole way,
Anything you can think of would be surprised what could be important during diagnosis