She ran away leaving her land in deep winter then was prancing about on a mountaintop singing about how wonderful and free she was without giving her people a second thought.
She struck her sister twice - ok, the first was a mistake but you'd think she'd have learned her lesson by the second time.
When Anna came to ask for her help she basically told her to fuck off then created a snow monster to chase her over a precipice (after striking her, as above).
Plus who would be happy living in an ice palace alone in the mountains? How did she eat? What did she do all day?
The other bit that bothers me is the 'sexy' hip-swinging walk she does when she first puts on the frozen dress. It's totally unnecessary. Why, just why?
Possibly overthinking this.