How is Mrs. Smiles described in the story, The Martyr?

From the text:

"Mrs. Smiles was a lean, middle-aged woman whose tough, determined nose and tight lips reminded one so vividly of a missionary. In a sense she was. Convinced that she and her kind formed an oasis of civilization in a wild country of savage people, she considered it almost her calling to keep on reminding the natives and anyone else in fact, by her gait, talk and general bearing."