Good question..

I suspect that Clinton asked technical questions on how media is performed in al-Jazeera and probably what needs to be done to get Al-Jazeera to help improve the greatly deteriorating US image..

On the other side, Al-Jazeera staff probably asked about Clinton's visit purposes, current trends especially those related to Iran and maybe try to explain how impartial they are to please the lady..

Just my guess but nothing unusual