I personally like the idea! Maybe perhaps (and I could be interpreting this wrong just to make my suggestion work ;)), you're trying to say that she is a beautiful person inside and out? If so, you could say/write: You strike me as a beautiful person - inside and out. Just thought you should know. Pass the kindness on to someone who strikes you as beautiful.

I dunno. A thought, anyway.

Personally, I'd leave it anonymous. I'd be SOOOOO tempted to put something on there for contact, but I really do think it should be anonymous. If you're meant to cross paths again, you will. :)