Usually, when Mormon girls marry non-Mormon men, these women forsake their religion and revert to ordinary American woman. The standard principles of day game apply.
Mormonism is not meant to be a casual part of a Mormon's life but it is meant to be the center. On her mind, her eternal salvation depends on marrying a worthy priesthood holder. Righteous love does conquer all but in some cases it takes a lot longer than we are willing to wait.