At the very least, I might have tried to persuade my husband to pursue a different career, if only a less-demanding area of medicine. IE в the comment about not having a husband to give priesthood blessings, etc. Basically this is different than dating a religious mainstream Christian. As a budding feminist, I left the church in my teens. A Mormon will tearfully and emotionally recite whichever lesson they need at the given moment.
And there are questions and lessons that dual-faith couples face that zero-faith or single-faith households do not. Unless you have some super amazing other dating prospect there isn't a huge reason to cut this relationship off now. Then you might want to talk about all the things her church requires. Your attempts at being funny or lightening the mood may backfire, and your date may be put off. She sacrificed two years of her life to convert people to the religion. Love the way you normalize the challenges of being married. Our relationship is not perfect, not easy, but absolutely amazing. Most likely, the relationship isn't going to survive your differences in belief. Why would you behave any different now.