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You might need to trade missionary lessons for research on her part, and we can suggest less scary resources. I wouldn't just give up, but be wary.
If you have a literal belief that you need to have a temple marriage to go to the celestial kingdom, you will always keep a secret desire to convert your spouse. That desire that they be someone other than who they were when they married you is toxic to a relationship.
That said, there are also a lot of pricks inside the church, who fully deserve membership. I wouldn't end a relationship with her, just as I wouldn't deny someone a job, or refuse to socialize with someone who is a Mormon.