The Year of Miss Agnes by Kirkpatrick Hill
From Simon & Schuster:
Ten-year-old Frederika (Fred for short) doesn't have much faith that the new teacher in town will last very long. After all, they never do. Most teachers who come to their one-room schoolhouse in remote, Alaska leave at the first smell of fish, claiming that life there is just too hard.
But Miss Agnes is different -- she doesn't get frustrated with her students, and she throws away old textbooks and reads Robin Hood instead! For the first time, Fred and her classmates begin to enjoy their lessons and learn to read and write -- but will Miss Agnes be like all the rest and leave as quickly as she came?