I'm thankful that this is one problem I've never experienced; I'm right handed and my right eye is the master eye and it's never shifted.
But one of my uncles does have the problem - he is also right handed, but the left eye has always been dominant. I've always been impressed that he had figured that out by age 10, and without any help. His training back in 1960 consisted of his father giving him a shotgun and telling him to learn to hit with it. He did it by simply learning to shoot left handed, and he has always been one of the best wing shots I have known.
With the technology available today, and easy fixes like the magic dot, it might be better to go a different route now. But I have always thought that my uncle was proof that if you start early enough in life it isn't that hard to just learn to shoot left handed.
Good luck to the lady on finding the best solution.
