 What else can she do? Rules of diplomacy say she can't ignore it, can't just pretend it hasn't happened.  This is how this kind of thing is supposed to be dealt with, it's just we've all got used to the buffoon with Twitter in the round room in the other side of the pond being a colossal numpty that we've forgotten that nation states are supposed to be restrained and kinda silly about this kind of thing.  