Ember's full song was not heard in the episode. The full song is located at the audio section of Butch Hartman's official website. It is number twenty four and entitled "Remember."
The "Flames" in the title allude to Ember, or more specifically, her hair. As a whole though, "fanning the flames" means to arouse or ignite somebody's feelings for someone else, which Ember does when she casts a love spell on Danny.
Even Though This Episode Premiered In 2004 It Was Made In 2003 According To The Credits