Rosemary Well’s Mary on Horseback is historical fiction about Mary Breckenridge, founder of Frontier Nursing Services in mountains of Appalacia after WWI. I also recommend The Year of Miss Agnes by Kirkpatrick Hill.
If you want a great old-fashioned fairy book and tire of those repetitive Rainbow Fairies, try No Flying in the House by Betty Brock.
Grace Lin is the Amy Tan of Children’s Literature. Her latest book, Where the Mountain Meets the Moon, is her best yet. Perfect for 2nd-5th graders or even older. She weaves Chinese folk tales into a tapestry of stories where the whole is much greater than the sum of its parts.