I think she needs a vet visit. Could be something in her eye, an infection or abscess.
Have you tried extra mistings? Shower?( not directly on her, but water hitting wall so it bounces off onto her).
Kath.
Quite amazed at how many eye issues are due to supplements, gut loading etc. If this is the case then surely it is having an effect on parts of the anatomy we cannot see? Just a general comment here but once again shows the importance of husbandry and feeders.