The Lunar Chronicles Cast: Cinder

My cast for Cinder, one of the main characters from The Lunar Chronicles by Marissa Meyer. Her storyline, for those who haven't read it, is Cinderella but, it is a science fiction series, not really.
Before I get a huge rant over my choices, I emailed Marissa Meyer about Cinder. Her description was "Mixed ethnicity" and "tanned skin, brown hair and brown eyes - the type of coloring where she can blend in almost anywhere in the world". She also mentioned that in her head, Cinder is more ethnic then caucasian. The fan casts I've seen cast people like Saorsie Ronan or Ashley Benson. Brown hair and brown eyes fit both the actresses. I couldn't choose between them but I'm leaning more towards Summer Glau because of her previous roles (Firefly, Serenity and Terminator: The Sarah Connor Chronicles) and in an interview and on her website, Marissa Meyer had said that she is a fan of Firefly.