Keeper of the Lost Cites by Shannon Messenger

Twelve-year-old high school senior, Sophia Fosters has always felt like she did not quite fit in at home and school.  Then one day she finds out she is an elf. 

"Am I supposed to help Frodo destroy the ring and save Middle Earth or do I have to make toys in the North Pole?"

If you liked the Harry Potter or Percy Jackson series this book is similar but with a female main character with flaws she works to overcome.  Will you be Team Keefe or Team Fitz?