With more self-possession than most adults, the young actress displays an awesome assertiveness that allows her to dominate absolutely anyone who stands in her way.
The heroine's fearless and clever character, the self-knowledge and self-possession her tormentors lack, and her gift for survival are fixed from first to last.
It's not real self-possession, where you are measuring yourself against your own internal standards and having a sense that you're working towards something.
Sunglasses frustratingly remind us of this impossibility whilst underscoring the sacred otherworldliness, detachment, self-possession and smooth demeanour of the celebrity.