At the Mountain’s Base by Traci Sorell; illus. by Weshoyot Alvitre Preschool, Primary    Kokila/Penguin    32 pp.    g 9/19    978-0-7352-3060-6    $17.99 In a cabin at the base of a mountain, multiple generations of Cherokee women await the return of their daughter/sister/mother/granddaughter, who is piloting a plane during wartime somewhere far away....