Yeah, parents can be difficult sometimes. Luckily there is no record I can find of a ball python injuring a human being more than a simple bite. No deaths that I can find either.
My parents still send me EVERY news article they find about snakes killing people though. And every time I explain, they are BALL PYTHONS!!! But they don't get it. They just refuse to educate themselves. I guess some people will just never be snake people.
All I can suggest is trying to educate your mom as much as you can. Make her read a book or research "snake attacks" or something. Snakes in my opinion are less dangerous than dogs or cats. If I get bit by a cat I am going to the hospital, with a snake? I am going to get a bandaid. Lol