Immediately prior to her retirement in early 2012, she had been playing as a forward for American Women's Professional Soccer (WPS) team Sky Blue FC.

Österberg Kalmari played in Finnish clubs Puistolan Urheilijat, Malmin Palloseura and HJK before moving to the University of Portland in 2000.

With Women's Professional Soccer (WPS) team Sky Blue FC Österberg Kalmari scored seven goals in 33 appearances across the 2010 and 2011 seasons.

[4] Following her senior debut in March 1996, Österberg Kalmari represented the Finland women's national football team 130 times, scoring 41 goals.

After a break from international football which included the birth of her daughter, Österberg Kalmari was recalled to the national team in January 2009 having last played in September 2006.