There’s no real evidence of any ‘grilling’ yet. During the 3.5 hours Hillary probably rambled on most of the time essentially saying nothing. Politicians do that all they time; they dance around the question and eventually you forget what the question even was. And then they leave.
Also you have to add in the frequent interludes to confer with her lawyers. There was no grilling but there was plenty of smoke, as in smoke screen.
Her pat answer was “what difference does it make?”.