from what i know, you can marry her and she will get all her paper. The only difficulty she will  face will be the interview, which she has to take it back home in nepal. It will be another 3-4 years before they will ask her to go back in nepal for interview and that will be within a  period of 180 days for her interview. make sure you guys file tax together and have bills together and a joint bank account. If she dont have ssn number then yu can ask for Itin# to file the tax together. good luck buddy for you and your girl friend.