The Female King
The story is all about a royal maiden, Berniss Rousseau (FL) who wishes to go outside of the walls to fly a red kite but her father does not allow her in doing so— because the reigning king believes it is for her safety to not flee from the castle grounds.
And when she discovers a secret door at the end of the hedge, she finally experiences the adventure and freedom she ever yearns in her life together with her lady-in-waiting and mute, Tadeo Febo, who disguises himself as a girl and possibly... a life-long companion.
https://m.webnovel.com/book/the-female-king_18392618805503805
Hope you'll like it! As of now, she's a princess and the genre's Historical Romance with a spice of drama, manipulation, and betrayal ;)