Audition song for a 13 year old!!?

my little sister's auditioning for a production of A Christmas Carol. In the youth ensemble, about 140 people audition and there are 14 roles. 13 is the oldest age a person can audition at so it's her last year. She's planning on doing a shakespeare monologue, but she cant think of a song. She's got a soprano voice, and can't sing a note any lower than the A below middle C. And lets face it, she's not the best singer. Some of her thoughts are Tomorrow from Annie, Think of Me from the Phantom of the Opera, and I Have a Dream from Mamma mia. Any other ideas??