She was practicing the Maple Leaf Rag at the time.  She’s beginning to work on The Easy Winners too.  Minutes earlier, she was listening to John Arpin playing it to get a feel for how it goes.  (She listened to a different version, one that we have on CD.)  When Marie begins working on a piece, she tends to play it very softly, even though her Dad would like her to play it louder so that he can hear it too.