I know I'm late (my internet failed) but I think the problem with the performance was the twirling (I'd be terrified) and the echos during the chorus, they made it sound like the audio kept cutting out.
Maybe she should start prerecording her performances when doing heavy choreo or something as nerve wrecking as the WA performance. Not necessarily lipsyncing to the studio version but a prerecorded one so it still sounds live...