The song isn't about the video. I'm sure she did it this way so that you focus more on the MESSAGE of the song rather than what's going on in the video.

I mean look at Adele's videos. Rolling in the Deep, Chasing Pavements, Make You Feel My Love & Someone Like You. They basically just focus on her, her and the song because, in my opinion, it makes it much more powerful that way.

Not every video has to be like Price Tag or Run the World or Poker Face. Some need to be like Best Thing I Never Had or Someone Like You because those videos really display the power of a damn good song.