Emma’s dad reports that she did all the work. There were a few missteps. He took her off the platform and carried her down. The thing that looks like a scarf on the left may be one of the many slings he and Emma’s mum use to carry her. He may have used it to partially secure her for the descent.
Just a reminder that Emma’s parents don’t push her to do anything like this. However, if she is keen and they think she can, they encourage her and spot her to ensure it is done safely. I suspect that it may be safer, on occasion, to support these deeds of derring do than repress them and take a chance on Emma trying something when they aren’t looking!