"The only thing that could achieve that would be if your father ordered me to be less watchful for some reason. Until that unlikely event happens, I will serve as your guard - and a close watch is critical to fulfilling that function." There were several potential layers to the trap - she could be checking to see if he was bribable, which she could thane take to her father. Or she could be looking to bribe him, and use his lack of watchfulnes as a reason to get her father to ditch him. Or she could be trying to get him to be less watchful so she could just give him the slip. All of those were enough to not walk right into that obvious trap.

'I'm so [i]terribly[/i] sorry that you're so [i]inconvenienced[/i] by being protected. I mean, I suppose I could render the whole issue moot and slice your head off now, if you'd rather? Or would you prefer to be stabbed in the heart? Or poisoned? I hear that's in fashion with the nobility these days. Maybe I could burn you alive? Drown you? Drop you into a pit of acid? Shall I go on?"