
The mc is so dumb I can't even

In my opinion, dumb is the wrong word. I would describe her behavior as helpless and alone. She was reborn into a completely unfamiliar world and into a body whose previous owner was fundamentally evil. o(>ω<)o
An established opinion of an entire society about a person is very difficult to change and i think the MC just wants to be herself.

Weak fls that are kind and forgiving to people that bully them are annoying, she even killed the dukes horse if I got my hands on that chick

Well I kind of understand why she would behave that way since she barely has any memories about her past and she was confined in underground prison for god knows how long. Plus, she havent learned anything about the outside world, people who havent learned things like that tend to be very forgiving whether we or they like it or not. She has yet to learn and perhaps once she does its her choice if she wants to change for the better or the worse or stay the same.
Not the hair cut come on