Honestly, instead of a spell, I would just try reaching out to her. If the two of you are still on good terms, perhaps you can catch up and set up a time to meet up, if applicable for both of you.
That being said, most people, I believe, have facebook or some other form of social media these days. You could always try looking her up there and saying hello to open up the pathway of communication.
You can try a lot of spells, but unless you actually take the initiative and put in a little effort to see your friend again, chances are it isn't going to work.