She showed great promise as a future sprinting star by recording, barefoot, 12.7 for 100 m at her first meet representing Hanvikens SK.

Haglund's precocious talent was displayed on an international stage at the European Championships of 1971, held in Helsinki, Finland.

Haglund was the captain for many years of the women's track and field team in Sweden and still holds Swedish records for 100 m - 11.16 (1980), 200 m - 22.82 (1978), and 60 m - 7.13 (1978).

A Swedish board of adjudicators found Haglund innocent of charges (she alleged her coach had given her two pills he called 'vitamins') but turned over their decision for further consideration to an international track and field tribunal assembled in Kingston, Jamaica, in 1982.

She also belonged to the Legends of "1956", a sports fraternity of outstanding Swedish athletes born in 1956: Björn Borg, Ingemar Stenmark, Thomas Wassberg and Frank Andersson.