How Lovely to Be A Woman is sung by Kim in the show, so that's what you will likely be viewed as while auditioning.
Kim is a teenager from Sweet Apple, OH, who wins a contest to get a kiss from Conrad Birdie, an Elvis-like star figure. She also has a boyfriend named Hugo who worries that she loves Conrad more than she loves him.
Try looking at this site for more of a description:
http://www.musicaltheatreaudition.com/shows/byebyebirdie.html