What Katarina is MOST likely hearing in this continuation is: Coda.
Coda is the concluding part of a song that comes after the basic structure. The Sonata form follows the ABA structure. The repeated A's connote unity in the music's flow while the B is a variety that is added to the music.
Any other part that follows this basic structure can be referred to as the Coda. This is what Katrina is listening to.
Learn more about the Coda here:
https://brainly.com/question/2939814