She wanted everyone to see her father and the princess the liars they are, manipulating everyone into thinking it was her brother who won the fight. At that point everyone will start doubting about other stuffs they've said and done and also whatever schemes they'll cook up in the future. Her revealing herself as the anonymous warrior was really a huge humiliation to the both of them.
No but then her sh*t sperm donor will use her to elevate himself. This way she can show everyone the clear discrimination and mistreatment by her "family" and draw a line showing that it's pointless to curry favor with the Duke if they want her power!
If she wants to prove that she’s a sword master wouldn’t it be better if she reveals her identity after fighting in the sword fighting competition? Like b/c she’s so good, everybody was already suspecting it to be her, so maybe while fighting the semi final she’ll take off her disguise and show she’s actually the princess? Then everybody would be like wait thays her fighting?
Cuz I feel like the best way to prove ure a sword master is if the public or everybody sees u fight. U bringing in the dragon rn I feel like doesn’t show that ure a sword master. Other ppl can still be like maybe she just tamed it somehow