How do I dm a girl that I saw 12 years ago?

Well i was studying in Italy and our school ex director came to visit with his family and he had a really nice daughter well at that. time i was 21 she was mayb 17. Its a christian school. We didn't spoke but i thi k they do remember me. I was to scared to approach her. I do have her in facebook as far as i can see she is single. I think. Well i want to dm her, but not sure what so say not to look weird she did liked my photo not so long time ago. Give me advice

How do I dm a girl that I saw 12 years ago?
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