Ohhhh, this girl played the flute! Flutes were nice and sounded really pretty if you knew how to play them correctly. Which she herself, did not. Only the girl hadn't brought it along with her to Hogwarts. "That's okay. I'm sure there's a flute or two in the music room that you could use to practice on when you have the time." Many students used that room all the time. Including herself.

"How long have you been playing the flute?" Surely long enough that the girl felt she didn't need to bring it along with her and practice all the time.