Lots of prayer and seeking God's direction. If you are at peace to wait, and you feel she is sincere with your and loves God, then there is nothing wrong with waiting. I have a cousin in the Philippines who has been dating a man from Croatia for YEARS. Never met, though they plan to get married. Took him a while to save up enough money to come visit her, then she went through some family stuff and wanted him to wait more. He's a good, Godly man, and has been a good influence on her Christian life. Sometimes, you just have to wait. I, personally, think she needs to let the poor guy come see her, but that's between them.
Don't be discouraged! But like was said before me, don't let your own desire influence your feelings. It's hard to balance, but stay in your Bible.