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My seminary teacher went off on me about dating a non Mormon when I was talking about going to his prom. There will be pressure to go to church, marry in the temple, Yada Yada You will want to make sure you're ready to battle this for years, maybe a lifetime.
Be open to the wisdom the Spirit will share.
On the other hand lol handshe may fall into tearing guilt and leave you immediately. Some mormon girls are closeted freaks as someone here has already said.
I've heard way too many stories of people breaking up with amazing people and they end up alone or in a less happy relationship.
As the patriarchal leader, it will be up to you to figure it out and to dispel her unrealistic fantasies.
I think love and caring can be more important. One of the most well known church prophets stated that he would rather see his own child dead in their coffin than married outside the temple.