Take into account your own feelings, her feelings, her parents feelings, your parents feelings, the short term consequences, the long term consequences then proceed to make your own choice. Dr.Drew's book about how to survive love and life would help too.
Don't do it until you are ready and absolutely sure it's what you want and it's not going to mess up your life. Your relationship will change in a major way, and she may expect this is a sign of a long term commitment you may not be ready to make. If you were looking back at this moment 10 years from now, would you be glad you did, or sorry you did? Be careful.