Am i seeing a different video? When she pulled the mic away after "all night" it sounded like it was the echo carrying the audio a split second longer. It seems like people are thinking her drawing the mic back to her mouth quickly means she was "CAUGHT!!1" when it's likely that she just realized she had a line to sing before the chorus
You can clearly hear her breathing heavily during the intro verse particularly around 1:15-1:30 and at times throughout.
Either way I'm not feeling the performance, she definitely looked/sounded nervous. Her vocals were uncharacteristically wobbly as if it was her first televised performance at times, she didn't seem to relax until after Jay came on.