Something has been nagging me since seeing the film...in the scene with Uhura talking to Gaila and Kirk hiding under the bed she mentions she was in the communications room and monitored a battle between 47 Klingon battlecruisers and a Romulan vessel. Now one would think this would merit immediately informing her superiors about a major space battle involving two bordering space powers
She's back early
, surprising Gaila, because the powers-that-be got all the cadets and unauthorized underlings out of the communications room so that decisions could be made. Of course she reported it.