She doesn't like to get involved in the scheming among colleagues.
Tips
history
Originally from the Tang dynasty poet Du Mu's 阿房宫赋, where it described the interlocking eaves and beams of a grand palace — the architectural hooks and angles of the structure. Later the idiom shifted meaning to describe human scheming and rivalry.
memory
勾 = hook/scheme, 心 = heart/mind, 斗 = fight, 角 = corner/angle. 'Hooking minds and fighting corners' — people using every trick and angle to get ahead of each other.