Finding old friends

I'm flummoxed. Off and on for several years now, I've found myself compelled to contact an old friend of mine from childhood. Not to reestablish some lasting friendship, just to see how she's doing. But somehow I can't bring myself to. For a long time, it would have been a matter of first tracking down her parents and then getting her information, and somehow that seemed like a lot of effort. But now, thanks to Facebook, I know exactly how to find her. It would just be a matter of sending her a quick message, along the lines of, "Hi! It's me! Is it you?" But now, even knowing how easy it would be, I'm hesitating. I've, in fact, been hesitating for a couple months. What if my message is rebuffed? What if she'd rather be left alone? Because here's the thing: of the two of us, I'm MUCH easier to find. My maiden name is uncommon; hers is quite common. So if she were interested in being found, wouldn't she have found me already? Clearly I've over-thought this whole thing...