Plan a day for them. It is positively shocking. Pants-to-Church Sunday left me a bit bruised. Good luck to you and your boyfriend. Many, many lapsed Mormons catch the true vision of the gospel at some time in their lives and desire to repent and become observant again. There are billions of other girls out there who I wouldn't have issues like this with. Thanks so much for the links. Basically nothing like reality. All I can recommend, as a docs wife of nearly 30 years, is prayer or to book a few sessions with a psychologist. If she expresses interest in converting, be prepared to talk about your beliefs, and help her find ways to learn about and follow them.
She is showing a common attitude of distrust for "anti-mormon" material. Your mids is still young. I married a person, not a religion. When my nomo husband does go to church we discuss the talks. I made the decision not to have those things when I married a non-member. If only I knew. Cold approaches on Mormon girls are challenging. Is this a sign of my own weakness. We get along exceptionally well and I really like him though, so I can see this going somewhere.
I'm engaged to a med student we met in undergrad 2 years ago and I've watched him go from playful college kid to serious med student. I tried my best, every bit of me…. I was scared to bring it up and make it seem like a demand or ultimatum, so I think I will approach him in the way you described. This insecurity is at the root of the princess syndrome.
I love talking religion with him and I have never pressured him to change his habits or anything else about him. That is a hard truth. Mormons are very particular about dressing. Based on what you have written about your GF, my opinion is that you should cut your losses and move on. I'm not marrying to be a single, working mom with money.