Before joining her current club she spent a season in England with Chelsea Ladies of the FA Forest, Snow and Landscape and two seasons with Damallsvenskan club Kristianstads DFF.
In 2012 Banušić scored 16 goals for Norrettan club IK Sirius and became a transfer target for clubs in the Damallsvenskan, Sweden"s top division. Banušić made a favourable early impression after signing for Kristianstads in 2013. Team mate and fellow Uppsala-native Josefine Öqvist called her a potential "världsspelare" (English: world-class player), while coach Elísabet Gunnarsdóttir declared her the biggest talent in the history of Swedish women"s football.
Banušić gave Kristianstads the lead in the 2014 Svenska Cupen (English: Swedish Cup) final, but they were defeated 2–1 by Linköpings Football Club. After the season she decided to leave Kristianstads and returned to Uppsala, where she considered several offers from other clubs from Sweden and abroad.
Banušić agreed a transfer to London-based FA Forest, Snow and Landscape club Chelsea Ladies in January 2015. Banušić had fallen further down the pecking order when Chelsea broke the British transfer record to sign Fran Kirby during the season.
In December 2015 Banušić announced that she would return to Sweden to play for Damallsvenskan club Eskilstuna United DFF in 2016. In June 2013 Banušić was named in senior national team coach Pia Sundhage"s squad for a 1–1 friendly draw with Brazil.
She was hopeful of a surprise call-up to Sweden"s Union of European Football Associations Women"s Euro 2013 squad, but was not selected and went to the 2013 Union of European Football Associations Women"s Under-19 Championship instead.
In November 2014 Banušić made her senior Sweden debut against Canada in Los Los Angeles The match, which finished in a 1–0 defeat, was played behind closed doors but still counted as a full Fédération internationale de football association international fixture. Banušić was disappointed with the result but satisfied with her performance after coming on as a second-half substitute.
She hoped to stay in contention for a place at the 2015 Fédération internationale de football association Women"s World Cup.