Quietly exiting the courtyard and leaving unnoticed, Anna instantly took to her heels without giving it a second thought, running through the hallway like a mischievous child who was fully aware of what she had done, and deliberately escaping the consequences of her actions.
Anna didn't need anyone to tell her she'd be blamed for everything that happened in there, most especially by Roseline and Lady Odette, so it was best to flee from the scene while she had the chance.
Well, to be fair she had planned on it but it seems like they were already destined to encounter the bridge even before she could commence her actual plan.