Like many people, I became a fan with I Kissed a Girl, a song that is both witty and warm, qualities that seldom coincide. At a time when the music business has squeezed out the middle, offering only massive stadium concerts or total oblivion, she’s resourcefully built a musical life — crowd-funding an album, touring with Warren Zevon, creating a show with Julia Sweeney, writing music for a kids TV show. We spoke (and she sang) at the Port Washington Public Library.