She probably has never read Huckleberry Finn, but was told by somebody that it was racist. That’s the way people grow up in this society today. They overlook one of the great works in American literature because one word in it offends them. I’m sure Twain wouldn’t mind if you edited the offensive word out. In fact, he’d probably be amused by the addition of “African-American”.
Mark Twain would be profoundly amused at a society in which certain people can call one another “nigger” or “nigga” all day long, while other people can lose their jobs for even mentioning the word’s usage.