I think you are coming at this from a religious point of view. If she loves you, your relationship will not come to harm, because she will refuse any advances made.
In the US she has freedom of choice how to live her life, and if you force her to choose between freedom and you, you may be in for a very nasty shock. She is NOT "yours " to do with as you wish, and If were in your plave, I would let her get on with it. If not, things WILL become very bitter between you.
I apologized for my error.
The fact is thet relationships form easily over a coffeee, a stray glance in the mall - almost anywhere. It is in the nature of being human.
Friendships are different from relationships that are inappropriate. That said, if you do NOT allow her to explore her rightful freedoms, it will upset her. She will become resentful and begin to feel feel controlled. Then, begin to hate you.
Better that you should explain to her openly, with no hidden agenda, how much you love her, and hw much you are afraid that you might lose her. Give her time and space to talk about her feelings - and this is important, without interrupting her. Listen, then listen harder, and between you, you will be able to work things out.