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When she goes on a mission, she will go through the temple which means she will be wearing garments.
Her attempts to convert you will get stronger and stronger, if you make it clear to her that you will not under any circumstances convert, she'll bounce. On her mind, her eternal salvation depends on marrying a worthy priesthood holder.
The big one is that under Mormon theology both of you must be believing, fully active members to live together in the afterlife.