Mikaela Shiffrin took the call that changed everything on the first day of February, at a mountain resort high in the Italian part of the Alps. She had been holed up there for an in-season training break, two months into a campaign that she had described in November as one of great “transition.” She wanted to build on her unprecedented 17 World Cup victories from a year earlier and add to her already-astounding career total. But she would continue her march toward the all-time wins record without her grandmother—her beloved Nana died last year—and while acclimating to changes with her team and its training operation.