She probably has not studied the real truths behind Mormonism and thinks her beliefs are the only way to become a God while living eternally with family in the life hereafter. BUT it could easily have gone the other way.
I have learned this painfully with my child growing up in the LDS community.
Now those are not the problems in my head anymore, whats in my head is how arewe goin to deal with this, ive told her sometimes u wont have anytime for me nor for your kids if we decide to have kids you wont be at the holidays nothing like that and she is always tryin to see everything positive and tells me dont worry ill schedule myself, and im like baby you will not be able to schedule urself your life would be in a hospital.
And you must retro pron honest in your conversation with God about it.