A dilemma, of sorts.

I am still considering contacting R2, a girl I met way back in '93 or '94 who went to live in America. We kinda lost contact down the years, but I saw her in the town recently-ish and I had previously found her on Facebook. The only thing that's holding me back is the wording of the message I send to her. What do I say to someone I haven't contacted in thirteen or fourteen years?