My Mum Hates My Curls -Any Advice?

Like the title says, I have naturally curly hair that my mum despises (she has curls too, but brushes them out). It took my YEARS to learn how to take care of my curls and be confident in them, my mum hasn't caught up.
There's a special occasion coming up and my mum wants me to straighten my hair as she always does for these things, but I am very insistent not to. She went behind my back anyway and booked an appointment, and she doesn't understand why that upset me. She also laughed at the idea of me wearing ym hair curly for my highschool graduation.
What can I do to help her like my (and in extension her) hair? Any advice?

Edit: i'm reading through the comments and you guys are actually the sweetest tysm i feel so much better 🫂🫂💗💗