Don’t worry fam, I got you. I pulled out my own copy and looked.
You right, in the original story the Queen had nothing to do with the mirror. Demon Teacher just made it to explode on purpose for shits and giggles, and Queen kidnapped Kay because she liked Kay’s hatred and indifference. You right.
I think the reason I got slightly mixed up is because while I had the original Anderson version, the version I was remembering at the time was slightly different. You know how you can read different versions of Cinderella where the stepsisters were forgiven, ignored, or tortured and blinded by birds? Yeah, I have different versions of Snow Queen, but only remembered the version where she commissioned the mirror in the first place.