It really does suck when your mom gives you crap about something like that. My mother used to call me Roseanne Roseanna Danna because of my hair. To be fair, at the time, that's exactly what it looked like. She never really gave me any trouble for my hair being curly but if it looked bad, she'd let me know. which was fine because it usually did look bad when she said something. Perhaps a lesson in genetics is in order for your mom. It's really more her fault your hair is curly than yours.
However, with all that being said I will say this. My mom died seven years ago. I'd gladly take the Roseanne Roseanna Danna comments every single day if it meant I could have her back. Let the comments go. There are way more important things in life. Don't spend the time you have with your mom arguing over something as trivial as how you wear your hair. Let her say what she needs to and let it go.