I think in an environment where you are constantly being manipulated or working against colleagues who are also competitors, it is hard to distinguish loyalty based on common interests or something a little more (in this case Har wanted her physically). I mean you can see all the guys in this manga likes her but they have different levels and ways of showing. I think what surprised her is that Har would act on it and almost killed her.

she’s so strong and smart but stupid as hell when it comes to har. she refuses to believe that he sees her as a woman. also what other bloody reason could he chain you up and try to seal your soul? fucking idiot