Some comments here say "it's ok to take a break", successful people can take a break, why successful people ctb etc. It's not that simple. I think, being in competitive sports, if you take a break, you're out. You can't get back. This may or may not be true, but might have some truth to it.
Her success, and the fame that came with it was part of her personality. It's not that easy to just say "ok, I can't keep up, let's just throw this away". And just take a break, stop the sport, stop the school, or whatever she was doing.
Also, it's all subjective and relative. She had high expectations of herself, but don't we all? We all want to CTB, because we have too high expectations of ourselves. Why don't we all just take a break? How to take a break? How to accept that I can't be who I want to be?