dd often freezes in crowds, can usually move her to a corner and talk to her to relax her, normaly takes 5-10 mins before she is back to normal and we can carry on, dd decided months ago she wanted to go to a concert for her birthday, concert was Saturday, we organised it that dd could go in 5 mins early to avoid the crowds, on leaving we tried to stay behind for a few mins, a member of staff came and shouted at us saying we had to leave now, we tried to explain but he wouldn't listen, half way down the stairs same guy started shouting hurry up get off the stairs etc, dd froze, couldn't talk, she was just standing there looking into space, with dp having to support dd as she couldn't even stand up, dd couldn't talk for 3hrs, she was just staring into space. I have never seen her this bad. could it be sensory overload?