Her vocals are a bit pitchy but it makes it sound so much more genuine. Especially loved when she struggled to hit those really high notes, but you could hear her emotion pushing her voice to hit the note.
And I kind of liked how she was singing at the wall. It feel that it was more honest since she wasn't letting the audience interfere with how she felt the song.
People saying she's pitchy.... she's not pitchy... being pitchy means you either go sharp or flat. And those belts are as centered as can be. It's just her breath support