To me it is unbelievable that people have to debate if she should have been staying with the team, people questioning if a mind-body-disconnect in a performance situation is a mental health issue (of course it is, been there, lived trough it a trillion times as an athlete, coached many head cases after it...).
There is no real border at which a physical injury becomes a mental one and vice versa: Your body and your mind are one entity, deeply connected (or not in case you get the twisties as in connected, but not aligned).
For illustration of this point:
From physical to mental: A broken foot can become a mental obstacle long after the physical part of it healed fine - think of pain memory f.e., fear of injurying it again and thus avoiding putting pressure on it a little bit for a long time, causing overuse injury in the other foot after a while...
Illustration the other way round, from mental to physical: A mental problem like the Twisties do cause very physical injuries if it causes the athlete to bail mid skill.
It is always about the whole human being. It is never only about physical abilities or a "tight mind".