She's may well be a racist and cannot palate the thought of having a 'darkie' in her brood.
She is definitely not a racist. She is just a brainwashed idiot. And regarding her decision to not produce a biracial kid with some African-American or Latino, I believe that she tried quite hard for the same, but was rejected by the men as she was too ugly. Look at her. I can't find any reason why the men will find her attractive.