You said in your last segment (Act Up) on TRMS that the NYSE had previously stopped trading only for war and when the Act Up protest interfered with opening. Trading was stopped when Pres. Reagan was shot, and I am pretty certain it was halted on 9-11 if it ever even opened. It was also halted when there was an excessive point drop (now changed to percentage), and for extremely bad weather. I was too young to remember if it stopped after JFK was assassinated.
I suspect this is the last time I could ever hear anything to correct on her show.
Everyone knows that there are trading stop triggers now (the infamous curbs), and everyone knows that the NYSE did not open on 9/11, or for the entire week afterwards (Wed, Thurs, and Fri of that horrible week).
I doubt she made the claim you seem to have heard.