At the 1988 Winter Paralympics in Innsbruck, Austria, Knapp missed the podium, placing 9th in the giant slalom race (with a time of 2:17.46), 4th place in the special slalom in 1:41.65 and 6th in the downhill (time 1:31.62). All races took place in the LW2 category.
Four years later, at the 1992 Winter Paralympics in Albertville, Knapp won gold in the LW2 special slalom with a time of 1:24.49 (silver for Nadine Laurent with 1:25.90 and bronze for Roni Sasaki with 1:26.05[2] and the bronze in the super-G LW2 (in front of her was Roni Sasaki, gold medalist and Sarah Billmeier, the silver medalist[3]). She also raved in the downhill; she placed 4th, behind the Americans Sarah Billmeier, Cathy Gentile-Patti and Roni Sasaki.