If it were me, the first thing I would do knowing her high school is create a Facebook account and upload her photo (with her face) and see who Facebook suggests I tag in it.

I'm not sure what the rules are concerning tagging suggestions, but I have noticed that it suggests that I tag people I know in other people's photos so you KNOW they recognize everybody in every photo - the trick is meeting the right conditions for it to allow it to share that recognition match with you based on her privacy settings I think...