This tbh but I understand why it had to be green, it matched her eyes color although different from the original novel. Also after I've read the novel, not just the description itself but also some dialoques/scenes got cut off. Not that it changed the story drastically but the pacing is different compared to what was written in the novel. I hope author still can pull all the greatness in the novel despite minor flaws because the novel itself is good.
Wait a second, now I'm at chapter 51 and it seems like there's a reason why her hair turned green. The novel mentioned that briefly. So author actually depicting that part correctly. I spoke too fast without knowing that there are another possibly scenarios unfolding in the next chapters.
I'm ngl I don't understand why they chose to make her hair green instead of just pure black like it's described in the novel.