If your friend lives in NJ and this's for a High School musical, PM me, lol. Our spring musical is that. Our director, however, gave out a packet with three songs, an alto, soprano, and tenor (I think) for the males and females (obv. different songs). If this isn't the case w. your friend, and their director doesn't want a song from the show, I suggest anything from an 'opera' type of show. If she has a high range try anything from Phantom of the Opera. I've never given a recomendation before, but I hope that helped.
A most ingenious paradox.