The name of this book is Indian Captive, by Lois Lenski. Most of the story takes place at the Genesee River which is now western New York. The main characters are Mary Jemison and a Seneca Indian named Turkey Feather.
Mary Jemison lived on a farm with her family in eastern Pennsylvania until April 6, 1758 when she was taken away from her family by the Seneca Indians. They took her to southern Ohio and then to the Genesee River to live with them. Mary was very scared on this long journey with the Indians. Poor Mary did not understand them and had a very hard time with them, but she soon came to understand them and made friends.