Well done for resisting temptation. Personally I would insist that the meal was somewhere else, Pizza Hut is just not going to work for low carbers. I know my kids love it and so does my husband but if they want pizza then we must go somewhere which also does something for me!
Even macdonalds is a better bet, have a burger without the bun. However somewhere even better is Harvester, TGI Fridays or Frankie and Bennys. Still child friendly but also Atkins friendly too.