Complicating race

In Our Nig, we can consider Frado a different character from the author Harriet Wilson in spite of the fact that it is mentioned, “In writing Frado’s heartbreaking story, Harriet Wilson recounts her own experiences while combining a subverting multiple literary styles,” in the back of the novel.  Why can we consider that Frado is an independent character who differs from the author?  I believe the reason is based on that Wilson uses the third person as a narrator, which inevidibly leads to the complication of race throughout the novel.  Thoughout most of Our Nig there are many clues the reader can use to assume what role race played in that time as well as the time of the author herself.  Because of the correlation between the story and the author, the idea of race and the role race played during that time can get complicated.