If you watch the full video though she's obviously "opposed" to the critique she's getting from the judges (the note), as she goes full Carrie on them in the end. The other girls celebrate her for it. My takeaway is that the pressure put on women is the men's fault, and women want to be free of it.

And I'm guessing the contents of the notes are real comments she's gotten over the years, not self-written notes to her current self. I don't see how you can read it any other way than this video being about revenge and freedom.

That said, I agree she looks sick and needs to heal from all of the pressure put on her. Obviously it's affected her a great deal. But I can't help to read this video as a means to get there, like public therapy, sort of.