Actually I am thinking a small epileptic occurrence. The kind that cause you to forget what you were saying , or forget the name of someone you know well. You know when you are distracted from a conversation and go back to the subject and have to ask, now what the heck were we talking about????
People will stutter when under stress just cant get the words out, and she seemed to be having a very hard time making sense to anyone much less herself.
Perhaps the constant flashing of camera lights and the high intensity noise got to her. If she was over excited at seeing all the well known people and still had to remember her script, ---who knows.
Whatever she will I am sure get the best medical attention and this may just be a one time thing. All in all she is one brave lady to carry on and not make a scene.