Just know that she has been indoctrinated to believe that she wont reach the highest level of heaven if she isn't married in a Mormon temple to another Mormon.
But, you will probably lose. Please see above link for full rules.
Their values and the values of popular western culture are wildly disparate, which can be tough for them to navigate early in life. She cried when you proclaimed your love of goodness because, in part, it was a sign that you weren't t and desperate for Mormonism.