Hey, mike. I can empathize. I've found myself in he same exact situation. This was a few years back. There was this guy named Trevor. We were really great friends, but for one reason or another, we were never able to become more than that, even though we both wanted more. Then he moved to Arizona. Long story short, we lost contact. Now, unlike you, I was able to let him go, lovewise. I would still love to be friends with him again though. Anyway, I'm rambling.
On to you... First things first, you have to think about the fact that she is so far away. Will you be able to deal with that? It is incredibly difficult to keep a relationship alive from so far away. If you can, then move on to the next step. If not, then leave it alone.
Second, you have to call her. It's always good to hear form an old friend. I'm sure she'll be thrilled to hear from you.
But this is where you have to be cautious. The last thing you want to do is pop back into her life just to drop the bombshell without knowing what has become of her life. You need to figure out where she stands before you say anyhing about your feelings. Perhaps she has someone and is intensely happy. You wouldn't want to ruin that, right? Just feel her out first. Find out where she stands. If there is no one, or let's say she's in a relationship with someone, but is not really happy, then let her know how you feel. You never know what could happen if you don't take the chance.
I hope this helps a bit and everything works out for you. Best of luck.
-faby