I tried to think of one song that would sum Lucy up but there's far to many of them so i decided to shortlist them into a playlist, they either just sound like the kind of song you could hear in the background to her, the title seems apt or the lyrics seem fitting.

Death on Two Legs ~ Queen
Fuckin' in the Bushes ~ Oasis
Kiss with a Fist ~ Florence + The Machine
The Elephant Song ~ The Enemy
Too Bad about your girl ~ The Donnas
The Captain ~ Biffy Clyro
D is for Dangerous ~ Arctic Monkeys
Fast Fuse ~ Kasabian
Rebel Rebel ~ David Bowie

What about your character, what would be playing in the background in the movie of their life?