Frustrating and painfully hard to read. Author has no idea what kind of importance/responsability does title of Duke hold. Also no communication. About MC, she is a spoiled little sister and acts on a whim without a plan.
It feels like only 1 character acts in a situation and everyone stares, then next one does something and others stare again. There is no logic behind anyones actions, it's like characters can do wathever they want and there wont be any protest from others (they will sometimes think in a correct way but never say or do anything to support it, it almost feels like giving a false hope to reader that situation could improve but once again character just decides to not to do anything).
Example of a frustrating situation:
Spoiler
Why did MC's brother ignore MC's warning and still took in a unknown girl from barony for a whole month to live with them? Because baron treated him to a dinner and gave him a carriage, but still, it's quite a big request from baron for a plain hospitality, no? Well, he is the same age (yes, age is the only thing) as MC's and brothers late parents so he looked very pityfull. And yes, this is a decision making of a duke who is also one of the most trustworthy aides of Emperor. What makes it more frustrating, he constantly sees/recognises that baron butters up to him but he still chooses to help out such greedy guy.