Any of Sir Arthur Conan Doyle's Sherlock Holmes books would work and for a bit of fun contrasting today's science fiction have her read his "The Lost World".
One other suggestion if you don’t mind. The Nancey Drew series of books(if you can find them)are a good way for a modern teenager to see what teenagers were like in the late 1930s and early 40s. Not to mention Nancy is a good role model:)