In the end she completed the event easily. You couldn't do that in Comrades. Mentally Ironman is also tough because you have to focus on three different disciplines. If you tell a Comrades marathon runner to swim 3.8km, cycle 180km and then run the marathon it definitely sounds quite tough. But Comrades is a lot more painful and you have to learn to manage the pain.
Ironman is a different challenge.
It's much longer and your body is more tired. You have to learn to manage your energy more carefully in Ironman because at the top level, it's around three hours longer. The mental side of Comrades is being able to deal with the pain, but in Ironman you have to concentrate for a lot longer. You have to train yourself to concentrate. I did a lot of mental exercises before Ironman.