What is the author's style in The Road to Memphis by Mildred Taylor?

The author gives Cassie an artful grasp of the language of Mississippi in the dialogs. The effect is to bring realism into the story and a sense of theater, where the reader hears the voices of the characters with greater clarity. The straight narrations are delivered in standard English with a slight hint of Cassie's voice and are intermixed with dialog to expand the story. Word choices are kept toward what would be expected at a high school level, and this makes the story an easy read.