I don't want to be insensitive. If you want to save your marriage then I also want that for you. With that said, however, have you envisioned life post-marriage? I only ask because from the interactions that you've had with her lately she doesn't sound like a very nice person. I know that could be some kind of fog but a lot of these conversations are pretty brutal. She hopes you get into a car accident? Does she have the emotional maturity of a 7 year old? It's going to be hard for you to have adult conversations about saving your marriage with someone acting so childish. You'll be the only adult in the room.