You'll do great, KD. It's such a nice feeling when kids remember you and want you to do something special with them, or share in their special time. A few of my former students, now with better careers than I have ;-), stay in touch with me and it's really gratifying to see where they've ended up after leaving my class.
I think if you concentrate on your feelings for the girl, you'll sail right through.

At least, that's how I write recommendation letters to grad school for kids!
Candy