Whatever the housemaid reason is, it is wrong in all sense of the world to hammer some one else's head. That housemaid might be telling shes been treated badly, do you think it is as bad as being hammered by her employer as well? If she have problem with her employer, theres other means to solve it, she hammers the lady while sleeping and not simply slapped her. Intention to kill is pretty obvious. Whatever reality is, whatever raison d'être, she should be punish for her grim actions.