While the focus of this discussion centered around the emotional aspects, what about the physiological aspects?
Depression can’t distinguish between the homeless guy on the street or the world champion athlete. I think we react differently when it’s someone that’s been placed up on a pedestal. It’s more likely that, on some level, this was there all along and the success that she had as an athlete allowed her to avoid dealing with her emotional issues.
I’d suggest getting to see a good functional medicine specialist.