Thoughtful Tree

A friend of mine, who also happens to be a mom in my school, shared with me her great idea for a "Thoughtful Tree". Her family creates the tree ahead of time and uses it as their Thanksgiving table centerpiece. This would be a great idea for teachers in a classroom. Each child can write one thing that they're thankful for on a leaf, and add it to a branch. This idea was just too beautiful to keep to myself:

My question is, how did she take a picture into a mirror without her reflection showing up? She's a photographer, so I'm sure she's got lots of tricks up her sleeve (or she uses photoshop!). I hope everyone had a wonderful Thanksgiving!