The freestyle star finished second behind Canada's Megan Oldham, who won by 1.75 points.
Eileen Gu was unable to defend the gold she won at her home Olympics in Beijing four years ago, but she has one more chance in the halfpipe later in the Games.
Home athlete Flora Tabanelli came third in Monday's final. Remarkably, Tabanelli competed despite tearing one of her cruciate ligaments ahead of the Games.
