Much of it is self-induced pressure that the other girls do not have. She listened to the hype and wore the goat imoji on her leotard prior to the games. She posed for photo shoots billing her is unbeatable and has no competition. Now, she's in the spot light and feels she has to live up to all of it. None of the other girls have that same amount of stress.
Sure, they're nervous and stressed, but they are not being billed as the unstoppable force where everyone else is playing for second type of thing that Biles is facing. That's the added pressure that I mentioned. Again, she allowed it and embraced it. Now she's possibly dealing with it.
I wish they'd have waited until after the Olympics to cement her is the unbeatable icon that she is labeled. She may still be that athlete but it may turn out that she is putting too much undo pressure on herself to perform flawlessly. We'll see how it unfolds.
I agree with you that "IF" she just bailed on the team, that's a bad look. We don't know if that's the case, though.