She's an author that publishes dramatic chick-flick romance novels secretly. Which resulted to her becoming some plot manic to the point it overrides basic sensibilities and common sense (you can almost say shes a 'hentai' for plots). So yeah, "The maginificance of a true villianness lady! How quickly she plots! How vile her words! Ufufufu I must remember this experince" is quite a literal summed up internal monologue she has that repeats throughout. Marielle doesnt care about society at all in my opinion. And although her fantasizes are internal, that doesnt mean it doesnt clue out externally (overt and covert) but other characters pretty much conveniently ignore them all and the MC goes on with her self-centered life of going Ufufufu for various things. In my opinion she becomes more unlikable with her fantasys as the plot goes on (but at this point there's only 3.3 chapters, so maybe it'll change. But I'm quitting the novel after this review.) Her character is also very shallow and the author has yet to provide any subtance to her character growth and depth.
Around chapter 50, the FL wanted to 'join' the war. The ML didnt let her, and so she escapes the palace. Fakes an identity as an general and essentially frolicks around army camps and plays around the town like a nouveau riche (and somehow didnt think it was easy to catch her).
So yes, is she downright stupid? Yup.
The country is at war, you go frolick around the frontlines and run amok in all male army camps (poorly hiding the fact she was female too). The FL knows some martial arts and weapon usage. But are you honestly kidding me? The fact that she thought she could participate in the frontlines without telling anyone (neverminding that she is the empress) or that she could potentially lose her life.
What's more frustrating is that the ML never punished her or reprimanded her afterwards. Just continued to dote... and then she escaped again, actually participated in the frontlines and gets captured by the enemy. And when she gets saved? More doting.