Not elementary, as in grade school. Barbara hosts the four major elemental spirits. Yes, this has something to do with Midnight Oil. You'll find out more than you ever thought you wanted to know on Barbara's Meandering Blog.
Downtown YA and Teen Word Factory. She's made YA her business model, and is succeeding very nicely at it.
The first book of Barbara's that I read (and enjoyed, by the way) was the teen contemporary, "If I Could be Like Jennifer Taylor." It dealt with a number of problems facing today's teen. If you have a kid just hitting the teen years, it'd be a great book to give them. It will help prepare them for the mean streets of middle-grade and high school. Barbara has also written a Parent/Teacher Guide to help discuss the issues in Jennifer Taylor with teens. The book is available from MuseItUp, Amazon, and other ebookstores on the internet.