No other symptoms, breathing, skin, activity, pupils react evenly to light, good normal control of legs & wings. Grabbed and checked all the others tonight when roosting and no other strange changes in eye pigment. The strange eye doesn't have the weird tearing or lopsided contraction of iris like in photos of Mareks. So it appears she is fine.
I figured out the scab is from a container I put in to hold grit and oyster shell, it is from an old rabbit hutch made of metal. They peck at an angle and hit combs, top of beak on the one edge. I may have to roll it under or cover, it isn't a sharp edge but I guess if they are pecking hard enough they could hurt themselves.
Thank you for comments.