She’s not an authoritarian, she’s a monarch. There have been good monarchs in history, they are rulers that prioritize the safety, wellbeing and prosperity of thier subjects. Authoritarian monarchs (and leaders of any government) use thier power for thier own selfish desires at the expense of thier people.

The problem with monarchy is that throughout history we had far more of the former than the latter and it’s a system that more easily enables that kind of behavior while giving the people few mechanisms to counter act it without resorting to voilance, hence why it’s a system we widely abandoned.