The only ones I remember her speaking of in the books were the “indians.” I do recall her mother had a fear of them, but her dad not as much. Also I don’t remember Laura necessarily sharing their view. In fact, in Little House on the Prairie I think she sees a “papoose” and thinks how beautiful it is and wants to keep it :) That may be where Dr. Tan, an “African doctor” saves them from some illness?
There’s a bit in one of the later books where all the town fathers get together during a Christmas party and put on a minstrel show complete with blackface makeup. Since she wasn’t prescient enough to condemn it and shout them down, OBVIOUSLY she was a terrible horrible badthinker and should never be honored for anything.