At this age, most of all White likes playing princess role (except when it comes to etiquette lessons) and doing magic. Her magical ability is rich and disturbing, and Twilight has a whole list of magic tricks that are forbidden at home and another one for tricks that are not allowed anywhere else, ever. White finds it funny and totally unfair — why would Mom try to stop her from doing something she's so good at, something that feels good?
Once she gets older she makes sure to try everything on those lists.