What kind of book do you want? Do you want one that refutes the Bible, or one that refutes the philosphical idea of god? Hitchens is a bit acrid in his book. He does however have a nice collection of essays throughout history in his "Portable Atheist." Let her read what the great minds throughout the ages have written on religion. Admittedly some of the essays will be above her head.
A simple book is "The Book Your Church Doesn't Want You to Read." It too is a collection of articles.
A simple book is "The Book Your Church Doesn't Want You to Read." It too is a collection of articles.
"On Earth as it is in Heaven, the Cosmic Roots of the Bible" available on the Amazon.