There is much that needs to change and many hearts to educate but if we doubt some of the fundamentals then why not all of them. Response to your edit: Do NOT bring up or mention anything that could be considered "anti Mormon. I like to think that what you said really resonated with her. Dont aggressively try to destroy her faith but bring up philosophical thinking points. He was the best decision I have ever made in my life, hands down.
He did 5 years of residency and a one year fellowship and has been in practice for nearly 7 years. Because she will think that all of a sudden she is going to hell for being human, that's mormon sexual repression. The sons inevitably went inactive later in life. We always went every Sunday, had family prayer and scripture reading, etc. I excused canceling plans, seeing each other only once a week, not being able to text much, etc. I do not see this going well. I would think that a comprise between you getting missionary discussions and her reading the CES letter would be even. Do whatever it takes to at least learn from your relationship with your Mormon crush. We have almost daily prayers, scripture reading, and lengthy discussions about our beliefs.
If you don't mind some slightly off-topic advice, I can assure you that you will meet plenty of other beautiful, interesting women going forward. This is not about either of you individually. For the official Church websites, please visit LDS. Too bad she couldn't handle the guilt and remorse. Vh65, your marriage is a black swan. Honestly, it isn't her fault. Let me say this so you can get an idea of just how crazy and how much your girl friend is into the Mormon religion: These are known as "garments". Of course I feel slighted at times, but I check myself and remember that my SO is doing his best given all his demands. Do you really love him, honey.
Fortunately most of my immediate family has done better. There are a great many beliefs I can't condone but most of them are along the lines of gender stereotyping, and how you apply that to your own life obviously varies by individual. Mormon decried it was all a lie, an anti mormon lie. And after dating a few months we both knew we wanted to get married. Did U have sex with her yet. You just have to decide if the payoff is worth it. As my husband learns about Mormonism I get to see it through his fresh eyes. I think that if these two really care about each other that she should be told to take a moment and ask herself how she would feel if they break up over this and years later she finally researches her religion. And your future kids will be taught that you are the reason they don't have an "eternal" family.