Lily did understand what Flint had mouthed, and returned a big grin for his smile. She couldn't help but sway to the music as in her mind she tried to remember the lyrics. But she hadn't heard this song nearly enough, so she gave up and started just appreciating the music.
A giggle escaped her at Flint's reaction upon realizing he was singing, but it held no malice, as nothing Lily did would. As the woman approached, Lily watched her pass by herself and stop before the piano man. She was sad he had stopped, but she understood he needed to, at some point.
As Flint addressed her, Lily's grin came back and she leaned closer to him. "Hiya, I'm Lily! You play wonderfully, I love it!" She said, holding out her hand.