The premise has potential but the execution is awful. The protagonist's character arc is a typical "emotionless character that doesn't understand love has their icy heart warmed by true love" cliche, and the supporting cast is just as one-dimensional.
The writing is extremely childish, vindictive, and self indulgent. In one scene, a little girl is rude to the protagonist, so the author quickly slaps together a justification for the protagonist to murder her entire family. It's like an overpowered reincarnation story mashed into a villainess story.
The central conflict is so unbelievably one-sided that the tension is non-existent. The protagonist has every advantage, and she's up against an orphan child. The antagonist has nothing going for her besides her entourage (who, as the author is quick to point out, are only using her for their own gain) and the support of the empress (who, again, is only using her as a pawn). Her only true ally is her adoptive mother, who is (very understandably!!) scared of the protagonist's callous disregard for life. I'm assuming the empress will take a more active role in the plot eventually, but I don't care enough to stick around and find out.
TL;DR The protagonist is a Mary Sue and the story is a terrible Frankenstein made from the worst parts of two oversaturated genres. Go read something better.