FWIW she probably wasn’t breaking any security protocols - basically as long as the kids can’t read well they are fine to be escorted without the red light.
I used to take my daughter into the SCIF when she was about 2 when needed, and there was a week where I was took my son into work at the Pentagon.
I working for Snake Clark at the time and people kept bringing him candies and treats. I think he was watching cartoons on Nick in the deputy’s office most of the day. He gets a kick out of that story now.