I know what your getting at, you dont like the appearance of the stained eyes, I dont blame you. BUT... What really matters is that you have a good dog or that you dont. That dog might turn out to be the best dog you have ever had or will ever have, regardless of the appearance. Its understandable for you to be disappointed in the ugly tear staines when you buy a beautiful breed like the Eng setters. Ultimately you just need to accept it and move on, she will prove whether she's a good dog or not, by then you will love her so much that the eye stains wont matter anymore.

As far as treatments go, I havent heard of any eye stain treatments.
And there is no telling whether it will stop or not whens shes older. You will find out in a few years I guess.