Michael Jordan took a *season* off to deal with mental issues. Quitting because one can't get there, or one can't handle the pressure, or whatever, is fine. It's not what any athlete aspires to do, but sometimes it happens.
What's hard to stomach is that same athlete trying to sell that failure as itself something to aspire to.
If she'd just said, I didn't have it today, couldn't handle the pressure, felt I was going to cost my teammates a medal, felt someone else would give them a better chance, we'd all be more sympathetic. But it's all about her and forget the team. Obviously those who played real team sports also expect that the best step it up and lead in the most difficult moments, but we all know also that it isn't always that way, sometimes the leader is a teammate who barely belongs on the team and is there, well, because he/she is a leader.
This stuff is particularly hard for people like Lebron or Biles whose success came when they were teenagers, before they had developed mentally, and who, as a consequence, never had the same struggles even most ordinary champions have. These kids have been living in a circus their adolescent lives.