What should I use to fire up a 14-year-old guitar student who learns well but rarely smiles?

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She has been my guitar student since she was 12. She has learned her scales and chords well, and we've worked on a few songs together, including John Prine's Paradise. She can even do a jazz progression I taught her, and play the proper scales over it when I do the chords. But she rarely smiles, and I can't really tell which songs "fire her up." She is cute as a button, but seems to have very little "silly" in her. Maybe it's because she is of Russian extraction. I don't know. Are Russian people often "serious"? In any case, I had a brain storm as I was writing this. I set Robert Frost's poem, Stopping by Woods on a Snowy Evening, to music many years ago while on the throne on a -20 F night in Iowa. Perhaps I'll try that one on her (and a couple of other students) today. The melody is simple and straightforward, and the poem is lovely and not inappropriate for a younger student. Do you know the poem? It was one of my favorite short poems in my "book learnin'" days.