One thing that could help with out irritating it further it is to put fragrance free skin moisturizer on it. I rescued a BP with retained eyecaps and made a humid hide with damp(not dripping wet) moss and put fragrance free skin moisturizer on it everyday and in a three days it fell off on its own. This way you are not rubbing or disturbing it much.

It maybe be several retained caps that are begining to affect the eye. Make sure you use fragrance free as most moisturizers have added frangrances that may cause alergic or other irritating side effects. Moisturizer just hydrates the area and softens the skin. You will have to hold her head/neck steady to get it right on the eye. All BP's do not like there head touched. I would do it once or twice a day with a humid hide. Cant hurt