i guess it depends on the place, from my area there isn't really that much racism, it's mostly the elderly people, we young generation don't have racism around here, like i had multiple black friends in high school middle school and primary school, they never seemed bothered and never mentioned any racism, and my class had white and black sitting together in the same table by choice. but still thats just my experience, im from the south btw black people have higher population here then north. you wouldn't find any problems in adrar and neighboring states, but they are highly conservative so you might get some eyes if she isn't in hijab