Fritzon's best finish at the FIS Nordic World Ski Championships was tenth in the 30 km event at Falun in 1993.

Fritzon, born in 1965 in Falun, was also a successful triathlete with a second place in European World Championship held in 1986 in Immenstadt, West Germany.

As a cross-country skier Fritzon became the first Swedish woman to win a gold medal in Junior World Championship in the 10 km event held in 1985 in Täsch, Switzerland.

Fritzon's best finish at the FIS Nordic World Ski Championship 1993 was tenth in the 30 km event at Falun, Sweden.

She has one gold, three silver and five bronze medals to her credit in the Swedish cross-country skiing championships.