Yes she is very stunborn and persistente.
But he lie to her because he is jealous - it’s a trap and he know this ins’t good… (yes he is young but...).
The events lead de younger girl to lose all her selfconfidance and now « she fail because she is stupid » ... she not fail because it’s difficult to learn new skill but only because she has a poor brain -



. She is not the heir of great family and she is young but why make her stupid ?
And for her sake the beautiful hero (with his big brain) come for confort her with such panache (I can't deny that this scene is very funny). But just because he have text her some « quote » and say he know her efforts, all will be ok ? I hope not. I hope the story will become more respectful of the FL.