It sounds like you HAVE done your best in the past. Once last piece of advice to you girls who are "dating" or "engaged to" a doc: Don't confuse "dating" and "engaged to" with "married to" - get the ring on your finger and seal the deal. Honestly, you are probably the only person who she has ever known to outwardly label themselves an atheist. That is a goal worth fighting for. If you want to date a Mormon guy or girl, then the best way to meet singles is by visiting the Church.
I think the most important thing is to bring up the issues as questions rather than points as why she's wrong. We have been together for around three years and I feel like now more than ever he expects me to just do things his way and not have an opinion. But I do still largely consider us an interfaith couple. Mormons have a well-known code of health, called the Word of Wisdom. It has been very difficult to reconcile our two expectations, hopes and dreams. I have had to compromise more often than I would have liked. Not the end of the world.
When he's not at work, he's busy preparing or at conferences or studying, basically non existent. My wife is living proof that they CAN be worth it. Fifty years later, not one of her 3 children, her dozen grandchildren or her numerous great grandchildren is an active member of the LDS church. I think the most important thing is to bring up the issues as questions rather than points as why she's wrong. He has changed a lot throughout this process, but I don't know what he will be like once we are finished. Its not only adultry. Dozens of missionaries have told me that the gender ratios in other countries are far, far worse. Willl he build resentment at the struggle to get him to change whether real or imagined.
I keep busy with my own activities, but it becomes really hard to have a date night. I do my best, I accepted him knowing the stress on his career, knowing that it isn't easy. Earlier I mentioned "Even if the church believes a bunch of crazy nonsense, and she believes it too, I still really like her and would like to see whether we can have some good intellectual conversations about this stuff. God brought the two of us together, and we are truly in love. Once she realizes you won't join and she can't get married in the temple, then I suspect everything will be over. She's too heavily invested in Mormonism for that. It's easy to be blind to deal-breaking faults when you are young and in love. While a part of me is sad about not having a temple marriage and getting sealed together I have hope that this could change while we are on this earth and I have faith in an ever-loving Father in Heaven who is kind and just and will be able to provide a way for my family to live together in the eternities.