She should pray about that, and if in her heart she thinks her God has brought you two together, she should be willing to endure all that comes.

As a christian, we are strongly advised by the Bible and simply by our faith working within us to not enter a marriage with a non-believer. This however, was never meant to be a religious rule, a divine command of any sort. This is like if you put something in scented water, the item will slowly begin to smell more like the scent itself. If God is real, faith would indeed be very precious and our loss if we are to lose it. However, God is not sitting in His high throne in heaven waiting for one of us to trip and fall and thus not be able to enter His Kingdom. That is Satan, not my God. Jesus is actively holding the hands of all those dear to Him, crying for those who choose to run away from his arms, and so forth. We can understand why God is so concerned, like a father, about the choices we make and how the people around us will affect us. He does not say that you are the rotten tomato that will eventually endanger your girlfriend or perhaps future wife, infact He loves you very much and just as much as He loves her.