Dear Katebcca,
The Good Lord has allowed me to know some wonderful people. My adoptive dad, my best friend, my grandparents--were all uncomfortable around other races. These folks were kind and hardworking! They took-in stray humans and animals, alike. But they were prejudice. I don't think they actually realized it themselves, sometimes. It's too bad. But that's a fact. I guess two generations ago, folks were brainwashed against skin color different from their own. Who knows? But give your mom some slack. Chances are, she doesn't realize how her actions come across to someone else. Good luck. Some of the dearest people I've ever known, had black skin.
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https://www.amazon.com/author/bonnie.mill-lemke
https://kdp.amazon.com/en_US/bookshelf