Her facial expressions do NOT fit the mood of the song. It's like she's trying too hard and she has that 'cutesy' look like "who me?" at a certain point/parts in the PV and it just looks ridiculous with this song. (You know that look with slanted eyebrows, lifting in the middle and slightly pursed lips)
I also agree the PV would flow better if she was not singing at all. It seems like like a soundtrack telling a story rather than her singing this song in the present setting. And I wish during the chorus there were flashbacks or something instead, showing what she is thinking about/re-calling in her mind.