S has the right to decide what she wants out of life. You can't debate a person into becoming who you want them to be.
It hurts a lot when a person you love doesn't love you back in the same way. But that's life sometimes. It happens and it sucks and you move on.
Maybe someday things will be different for her. Maybe they won't. But for now this is what she wants, what she feels, and what she believes. Talking her into being different isn't going to make either of you happy.