Steve... sorry, but "made a mistake" is not necessarily the same thing as 'failed to execute as planned'.
And in her case, it would have been dangerous to "...have immediately got back on her horse" when she KNEW from years of experience that there was more to it than just 'losing concentration'.
She could not, even in practice away from competition, control those twists. She did try, and she hopes the issue will be resolved.

    That 'twisties' problem is well-known among gymnasts. It is more than just timing and concentration. If this works for you, watch her floor routine when it works perfectly. In a couple of those passes, she combines twists with flips in a way that no one else even attempts. To get lost in the air during one could be serious. Being 'slightly off' is not the same thing.