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A Wrinkle in Time [bonus female protagonist]. Hitchhiker's Guide and Foundation. She'll thank you later, though if she really likes scifi she's possibly already read them. Clarke's 2001 series. Ender's etc. Do Androids Dream. Bradbury and Wells. Really by the 8th grade, pretty much all scifi is within a kid's grasp. Goodreads has very specific user-voted best of lists, including, I'm positive, YA scifi. Check there maybe. EDIT: I gotta say, by the age of 13 there's no point restricting yourself to the normal YA crap. Get her to understand that 50 years ago there was real literature written for people her age. They didn't need a whole other genre.