Well, I'm a former English major, and I have to say I've never been big into the "inspirational" books. However, when I was going through diagnosis and treatment, a friend who had leukemia gave me a book called From Victim to Victor, by Harold Benjamin. I did read it, and I did find inspiration in it. I passed it along to a friend who was diagnosed after I was. She was very much into the "inspirational" books. Her favorites were Lance Armstrong's It's not about the Bike and, sorry I can't think of the author, but it was called When Bad Things Happen to Good People...by a Rabbi, I think.
I hope you'll think about this for a minute, though. I propose that laughter is ALWAYS the best medicine. If she loves George Carlin, buy her a Carlin book. If she loves Calvin and Hobbes, buy her one of those books. If the latest panty raid on poor Britney Spears' closet makes her laugh, buy the latest copy of People magaizine.
When you receive a diagnosis like hers, everyone wants to give you "inspiration." If you can help your friend to laugh and FORGET THE DIAGNOSIS, if only for a few minutes, you have respected her life, who she is, what she is, and what she means to you... and that is a precious thing, when a friend can look past the diagnosis and you know they see YOU, and not "the cancer."
Hope this helps...
"There's a difference between a philosophy and a bumper sticker." --Charles Schulz