Career
Blackstenius began her career with local club Vadstena GIF. In the 2012 season, she played for the club in Division Three and scored 38 goals to finish as top scorer. Prior to the 2013 season, Blackstenius signed a three-year contract with Linköpings Football Club. She enjoyed a successful debut season in the Damallsvenskan, scoring eight goals and posting three assists. In January 2014 she extended her Linköpings contract by a further three years.
As a Sweden under-19 international, Blackstenius featured prominently at the 2015 Union of European Football Associations Women"s Under-19 Championship.