Featherlow: Bird out of Paradise

Most twelve-year-olds don't have to do battle with corrupted gods:

Eva Featherlow doesn’t fall into that category. She is a twelve-year-old girl who accidentally rescues injured phoenix, Alister. Eva unknowingly is the key to unlocking the Phoenix's powers. She is destined to follow in her mother footsteps and becomes a sage. Caught between her family and the war threatening to consume the world, she must make a choice: fight or flight.