Why can't the ice queen just make snowcones and get along with all the people in this winter ball?

Oh yeah, she has an ego, and just can't take any competition.
So, the only minions that can be near her, for any length of time, are green goblins and ugly trolls.

When Mary grows up, she is going to be a real knockout, a real stunner, a real smack you into the middle of next week.