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There comes a day when I don’t have to be a Princess. No rules, no expectations. A day where anything can happen. A day where I can change my fate.
— Princess Merida · Brave

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker longs for a day free from the role of princess, with no rules or expectations, when anything could happen. It's a hope of changing her own fate rather than following the path laid out for her.
Context reviewed