Her physicality is the key. In the opening scene, her body is rigid, corseted, and trembling with suppressed hysteria. When she breaks down—sobbing, throwing a shoe at a harp, hiding under the covers—Hepburn makes the breakdown feel like a nervous system reboot. Then, as "Anya Smith" (her incognito alias), she transforms. Her spine relaxes. Her smile becomes lopsided. She gapes at gelato, hacks at a cigarette, and dares to lie to a man’s face. The haircut scene, where she joyfully hacks off her royal locks into a pixie cut, is a cinematic act of rebellion. That haircut didn’t just change her character’s look; it changed Western women’s fashion for a decade. Hepburn’s genius lies in making us forget she is a princess, only to remind us, in the film’s devastating final act, that she will always be one.