Maybe sonically it would come come across better with an arranger, but not visually. The interesting thing about looping is seeing the performer play several parts on different instruments.

As far as the chord changes, nothing wrong with reharmonization. I think she has the skills and ears to figure out the original changes .I believe she simplified the changes for a musical reason, which is to give the song a rock feel. Jazzers have always reharmonized pop songs often with more complex changes. She’s doing the opposite. Different approach for a different musical genre.