I think it's a both thing. She recognizes that she was an active contributor in her own misery, and that the kind of person she was would probably have self destructed in whatever activity she chose.
But she was also subjected to and witnessed heaps of emotional and verbal abuse, threats of physical abuse, dangerously negligent coaching and disregard for athletes' well being, encouragement of eating disorders, and was under several coaches later identified (and some rumored at the time) to be sexual predators.
There were a lot of problems endemic to the sport, and she was someone who was going to self-destruct no matter what. Putting a win-at-all-costs person in a win-at-all-costs environment never ends well