Probably really late to reply in that you already may know what is wrong since I think you were mentioning you would see a vet. One of my girls had a very similar thing, and she fixed it herself. Her eyelid was actually folded inward (the lower lid). When I got a hold of her I attempted to help her out but she didn't like that very much. The next morning, she was back to normal but had a little gash out of the bottom of the lid which I can only guess was from her claw pulling the lid back into place. Just thinking that's what it could be for yours also. Best of luck.