While
you both everyone is technically correct. You're forgetting a very important thing. She had with her a platoon of guards to act as her escort.
Running off aside; a royal, be it from now to ancient times, would not be active unless debuted- especially in the mean street. They'd just have the help preform their tasks for them.
Sheltered youth, back in the day, were just prisoners in their own homes and would never be given the ability to leave outside of escapes.
@forecast
If tropes are anything of use, certain birthdays are also considered times of revealing. We all gotta remember, this ain't medieval times. It's someone's make-believe world that resembles ours.
@forecast's reasoning makes the most sense, in the long-and-short of it.
I still stand by you can't be like this unless its a manhua.