Honestly this child is such a pompous idiot I'm surprised she even managed to do anything bad enough to warrant execution. Like it seems the worst thing she ever did was a spot of Mean Girls at the academy, other than that her sins are a result of sheer arrogant idiocy. Seems the only reason she met guillotine-chan is because of people holding grudges and ascribing to malice what is actually best explained by her brain being as smooth as a marble. Like don't get me wrong she was and is a useless princess, but that's not reason enough to kill someone. What, she's dense as a brick and has an overinflated ego so off with her head? Please.
It's a great series, though, very enjoyable. She's basically the anti-Tanya, for those who have read/watched Youjo Senki. Constant misunderstandings but always in the most positive way, whereas Tanya is misunderstood usually in a negative way that leads to greater hardship. Shenanigans ensue regardless, but the tone is rather different. Also rather than being hyper-competent, Mia is absolutely useless. If you sat her on a desk she could hold papers down... probably.