It’s claimed she was suffering from ‘The Twisties’ - a condition where a gymnast loses the ability to be aware of his/her position in the air when performing. I’m guessing it’s a psychological, as well as physical, condition. Beth Tweddle gave a good explanation on the BBC Olympics programme yesterday.

It’s up to the individual to decide whether they believe it, but it sounded fairly plausible when Beth described the condition.