Well, she came back, and won a bronze. And I'd take the acceptance of her teammates and coaches of the opinions of random haters and know-it-alls. I understand "twisties" (although I quite likely have some misunderstanding). There are some diseases/conditions which bugger up the connection between the brain and the body. It's not inconceivable that mental/emotional factors might do the same.
I have nothing but respect for Biles.