For the love of Mozart

So I have this student with one of the oddest, most charming quirks that I've ever witnessed while teaching flute.

She's been working on a piece by Mozart (Andante in C for all you flute folk out there) that she absolutely loves. Throughout the piece there are several cadences, or places where the music naturally comes to an end, as in the final sentence of a great paragraph. At these points, there is 'formula' of sorts that Mozart and his contemporaries used to highlight these moments of completion that goes something like this:

TRILL! - 2 - 3- 4 da da da!

They are the kind of recognizable moments that help define the music of this era. They are lovely, gracious endings that one can count on when playing the music of this time.

My student loves them. I mean, really, really loves them. So much, in fact, that she cannot get through all 4 counts of the trill to the da da da ending because she is smiling too much. So her cadences go something like this:

TRILL! - 2 - 2 1/2 (smile) unfocused air sound - tiny amounts of suppressed giggling - ....

And then she stands up straight, smooths the front of her shirt and says "Okay, sorry," and begins again. She furrows her eyebrows, makes her most serious face, and then... smiling.

I'm not totally sure what's going to happen when she actually plays this piece in public. Her best attempt so far was to hold off the smile until the 3rd beat...