The Sign of the Carved Cross by Lisa M. Hendey

Katie joins her friends in being mean to the new girl, Lily. But suddenly, Katie becomes the new girl—in 1675! She has no idea how she traveled in time to a Native American village, but she's hoping the young woman she meets will be nicer to her than Katie was to Lily. Tekakwitha is a quiet girl with scars on her face from a terrible disease. Tekakwitha's family doesn't accept her because of her faith, and soon she and Katie have to run away in the middle of the night. Will Katie ever find her way back home? Book 2 in the Chime Travelers series, exciting new chapter books ideal for children in grades 2-5.