Mikaela Shiffrin says she is dealing with post-traumatic stress disorder following a crash in November and will not defend her gold medal in giant slalom at the Alpine skiing world championships.

Mikaela Shiffrin is still feeling the effects of a violent crash she experienced in Killington, Vermont, on November 30. But it’s the mental recovery that’s taking more time than the physical recuperation for the most decorated alpine skier in history.

Mikaela Shiffrin will not participate in the giant slalom at the world championships in Austria, citing mental readiness after a recent injury. Instead, she will compete in the team combined event alongside Breezy Johnson.