I swear this is dubbed or lip-synced. There are several cases where the audio doesn't quite line up with her mouth movements. Plus the audio sounds like it was recorded in a sound booth or something, as opposed to live audio during the video.
It's a really good job, but not quite perfect alignment. At the very least, she's gone and dubbed over her own video.
I thought maybe some of the visual effects might have resulted in the audio getting slightly out of sync, but it sounds odd from the start before any of the fade/cutaway effects start.