In the 1984/85 season, the slalom specialist won the World Cup races in Davos (Switzerland) and Bad Kleinkirchheim (Austria). When she won her debut on December 9, 1984, she wore the number 22; The day before, Traudl Hächer won the Super-G, the first career victory . In total, Guignard made it into the World Cup 32 times, including 20 times in the top ten (10 giant slalom runs, 9 slaloms, 1 combination).
In the same season she was slalom vice world champion in Bormio / Santa Caterina behind her compatriot Perrine Pelen . Guignard was only ranked 8th after the first run. A protest brought in by the Austrian and Italian Ski Associations because of an alleged peat defect was rejected after studying the TV images. In 1984 she became French champion in slalom and in 1992 in giant slalom .
In the giant slalom of the 1989 World Ski Championships in Vail, she reached third place, but was then disqualified for a doping offense. Her first bronze medal was later awarded to the Yugoslav Mateja Svet .