Thanks, I will watch her closely.
I had Buff Orphington do that a few months ago - my daughter brought her home all shaken up and screaming "OMG, there is something wrong with my chicken" but the chicken opened its eye a few minutes later and it was fine after that.
So this time, I wasn't too concerned about the eye. Except I noticed this chicken acted a little strange in the mornining - kind of tired, out of sorts - standing still, puffed up and not scratching as much as the others. Then she went to the coop and sat in the nesting box. I already gathered the eggs that day and didn't think she was due to lay again. And she didn't. Isn't wierd?