if you care (you probably dont), The Ringer has a podcast for the Olympics and they had a journalist from the WaPo who is in Japan and is also a former gymnast who spoke on this whole situation, and who can and did explain this "twities" phenomenon way better than I can.

definitely not a fear of losing. the fact that she was in a position to win (the team was, really, not her) doesn't matter.

her performances would have continued to be bad because of this phenomenon which would have hurt the team even more and they probably wouldn't have medaled at all, and she could have potentially got seriously injured.

we'll see if she can get in a space to perform by the individual events next week. people who know say this can sometime take weeks or month to "fix".