I don't think she's a tsundere though, she genuinely loves her fiance (and shows it quite well) so it's only natural (though anoying) that she dislikes the one she thinks to be her fiance's lover.
And I think that she still dislikes the mc, maybe less strongly, but she still dislikes her, so she doesn't fit the description of a tsundere.
But well that's only what I think.
I thought she loved him, but it could totally be just as you said (thankfully the author made it clear that ml only had brotherly love for her) and just as you said, I think her personnality suits her age and her education as a noble (not opening her legs even to ride a horse for example).
If we look at it that way she is actually quite brave and mature (considering how she revealed her hair, reassured her maid, and accepted to be quite humiliated both by the "I need to go to the toilets" act and the fact that she had to wear tattered boy clothes).
Yea I agree, I do believe that her immaturity makes sense with her age, but for me I didn’t truly start disliking her until she was physically hitting the MC for no valid reason and the MC was clearly saving her. But more than her actions it’s that she’s not being told what she should and shouldn’t do properly, it makes me feel like she would just keep on being this way and even get worse because she’s always pampered. No one properly teaches her why she shouldn’t do some things and even if they tell her to stop, it’s just gentle and futile.
Not calling MC by a proper name, and instead going with “sodomy” just makes me really angry. Maybe it’s because a lot of my friends are gay so I just despise homophobia (as I should as a person). I understand that the time period was not very open minded, but the princess using such a slur to address the MC aggravates me, the fact that no one is educating her properly makes me even more angry.
I’m not sure if anyone finds her actions funny and cute, but I really can’t. She reminds me of a mini Karen, and at least the Karens in real life are condemned, but she just kinda just gets away with the things she does.
I ALMOST changed my view on the princess but god she’s still annoying as ever. Idk if the explanation for her behavior is that she’s using a shitty attitude to cover up her insecure/weak/fragile insides or her angsty back story, but I wish it would have made her more mature instead of being a little bitch. Tsunderes are cute when done right but this is just HSHDIEBEIYSG STOP