During Sophie's second time to Alex's apartment, he has a lyricist writing a song for her. Sophie starts spouting lyrics that end with "way back into love." How could she have known what the song was titled since they didn't see Cora till after her first plant episode?
Alex and the lyricist are writing a song for Cora, not for Sophie. While Sophie walks through the room, Alex sings lyrics ending with, "but you'll die on your way back into love." Obviously Sophie was listening as she sang some alternate lyrics to herself. When the lyricist puts her on the spot, she simply ends with her lyrics with Alex's last line. There's is absolutely no references made about the title of the song in the scene.