This girl who might have never actually heard "California King Bed" before singing it
You can tell right from the beginning this cover is not going to go well. First off, she's fidgeting around—playing with her hair, trying to find a good spot on the bed—so clearly she's not comfortable. Prime positioning should be established on take one or two, not the final video uploaded. Secondly, the sound is all over the place. Sometimes you can hear the track in the background, sometimes it's barely audible. We're not saying you have to be an audio engineer, but maybe take a minute to test it out, you know? Lastly, she looses the melody, makes up her own pitches, and pauses so many times that by the end you're not at all sure if this girl has actually ever heard "California King Bed" before.