I would second the taking her to see a ball python, if she's willing. Ask her if she'd be willing to meet a ball python, since I find meeting the creature does the most for helping people not be afraid. Then I would show her a young ball python, since people find the size less intimidating and are more likely to give the animal a chance to display its natural charms. Otherwise I'd second waiting till you're 18. If you end up going to college and living in any sort of apartment, rental or dorm keeping a snake may be difficult to impossible. In which case you'll have to leave it home with your mom. And if she's terrified of your snake then no one will be happy with that arrangement.
I wish you luck though![]()