Why do you think she is dumb? It's not like those reincarnation story where fl read the book beforehand or possessed someone's body who was miserable or died once
I mean she knew that devil kid killed her people and as a empress her reaction was so off.
He told her he didn't want to he was controlled by that evil emperor,( i forgot his name) Also she knew he was strong and that's why she kept him
She didn’t want to be the empress, and it wasn’t his choice. He was basically a slave/puppet to his emperor
There's a reason for that, and spoiling it for you will ruin your reading experience.
Not gonna lie but for a reincarnation fl sure is very dumb