She calls the maneuvers "unnecessary," but also claims she's worried about school shootings and "tensions." A bit of a contradiction, there, unless she thinks that ROTC are the ones doing the school shootings.
I doubt she really worries about something as rare as campus shootings, or that she was in any way frightened by the ROTC. I'm not sure she really called 911, though she may have done it just to pitch a fit.