Smith made it three victories from the three World Cup events so far this season in Val Thorens on Wednesday however that run finally came to an end as the tour moved to Italy.
She just about made it into the small final in Innichen-San Candido before finishing last in it, placing her seventh overall, as 2011 world champion Serwa won the big final.
Serwa got the better of Canadian teammate Georgia Simmerling to finish first while Smith’s fellow Swiss skier Katrin Mueller was third in a three-strong big final.
After a ninth, fourth and 15th, Serwa now sits third in the overall ladies’ ski-cross World Cup standings with 195 points with Smith still comfortably in the lead, 129 ahead of Marte Hoeie Gjefsen who was fourth.
And, while there may have been disappointment for Switzerland in the women’s event in Italy, there was success for the nation in the men’s as Fiva came out on top.
Fiva won the big final ahead of Daniel Bohnacker, Victor Oehling Norberg and Tomas Kraus as the overall World Cup standings became a whole lot closer in Innichen-San Candido.
Armin Niederer, leading thanks mainly to two wins so far this season, didn’t event make the quarter-finals, ranking 18th, while Brady Leman won the small final to claim fifth.
Niederer still leads with 273 points with Canadian Leman second on 245 while Fiva’s first win of the season and second podium finish puts him just one point behind in third.