That looks like "bully eye" to me. Generally it is a bacterial infection.
If it were an upper respiratory bug you would see swelling in the nasal areas. If you can find some eye drops she should be fine.
They call this bully eye because it looks like someone walked up to them and punched them right in the eye.
Bully eye huh? Yes, it does look like she got punched right in the face! I am hoping she just got pecked or something got in there and irritated her, hoping it's not something worse.
I think I'll just keep cleaning it at least once a day with the saline solution and see what happens.
Just to be safe, do you think I should be keeping her separated from the other two until the swelling goes down? I have heard that chickens will peck at anything and I don't want her to get worse...or to possibly infect the others.