She is a centre forward or outside shooter who has represented Australia on the junior and senior national teams.

She plays club water polo for the Brisbane Barracudas, where she won a league championship in 2010.

[5] She lives in Cardwell, Queensland and attends the Brisbane North Institute of TAFE, where she is studying for a Diploma of Justice.

[17][18] In 2014–15 season, she played for the Greek champions Olympiacos in the European competitions, winning the LEN Euroleague.

She was instrumental in Olympiacos' triumph, scoring 4 crucial goals in the 10–9 win against Sabadell in the Euroleague final.

[21] At the same tournament, Southern scored one goal in the gold medal finals match where her team took silver following a 10–9 loss to Hungary.

[22] In July 2010, she was a member of the Born '91 junior national team that toured New Zealand and the United States.

[10] She was a member of the Stingers squad that competed at the FINA World Cup in Christchurch, New Zealand in 2010[10][24] that finished second.

[2] In February 2011, Southern was a member of the team that competed against Italy in the International Series in Perth, Western Australia.

Southern was part of the team that competed at the International Series in Melbourne, Victoria, scoring two goals in the second match against Canada.

[28] She was a member of the squad that competed in a January 2012 three game test series against the United States women's national water polo team.