If you are a minor then you must be 15 or under, it's not really something a 15 year should have on their mind. When I was 15 any girl I was going out with was amazing as well, but take it from me, and others here, you'll be doing her a favour by never inviting her to the hall. The fact that your parents are allowing you to go out with her, as a minor, tells me they are aren't hard core, and the fact that you are doing it shows you aren't hard core so why you'd want to take her is beyond me.
Enjoy your youth but don't ruin hers by introducing her to a cult.