Ralph was born on 8 August 1988 in Geraldton, Western Australia. She has three siblings, one of whom, Mercedes Ralph, has represented Australia on an international tour. She is tall, weighs and is right handed. In addition to water polo, she has also participated in competitive swimming but made the commitment to water polo because she found swimming boring. She has an associate degree in School Dental Therapy from the Curtin University of Technology and currently works as a dental therapist. She took time off from competing in water polo internationally in 2007 to complete her studies.
Water polo
Ralph took up water polo at the age of thirteen, with her first competition being the Melville Flippaball Competition. She has a water polo scholarship from the Western Australian Institute of Sport. She plays in the centre back/driver positions and prefers to wear capnumber eight. As a young player, she would get up at 4 am to get to the pool to train.
Club water polo
Ralph's water polo club is Melville Water Polo Club and she plays water polo for the Longmont Fremantle Marlins in the National Water Polo League. Her team won the National Water Polo League championship in 2003, 2004, 2006 and 2007. She was with the team in 2007 as an eighteen-year-old. During 2010, she was coached by Wendy Arancini, the mother of fellow senior national team member Zoe Arancini. In 2010, in the finals tournament, she was named to the league final's All Star team. Her team finished third, beating the Cronulla team 11–9 in the bronze medal match. She currently plays for the team with her sister Mercedes.
Junior national team
Ralph has represented Australia on the junior national level. She was a member of the junior national side at the 2007 FINA U20 World Championships in Porto, Portugal that won a gold medal. She was one of only two Western Australians on the team.
Senior national team
Ralph is a member of the Australia women's national water polo team. She made her senior side debut in China in 2006 during the preliminary rounds of the FINA World League. She competed in another tournament for the senior side in 2006 because Melissa Rippon and Taniele Gofers were injured. She was a member of the 2009 team that finished third at the FINA World League Super Finals in Kirishi, Russia and sixth at the FINA World Championships in Rome, Italy. In 2010, she was a member of the national team that competed in the preliminary rounds of the FINA World League in Japan from 21–23 May and in China from 26–28 May. Australia finished second in the tournament. In 2010, she was a member of the Stingers squad that competed at the FINA World Cup in Christchurch, New Zealand and earned a silver medal. She played in the game where Australia beat Greece by a score of 11–7. She scored twice for the team during the third period. She competed Australia's 10–8 defeat of Russia. In the third quarter of the match, she scored two goals. At the 2011 Canada Cup, she scored s goal in the first period in the gold medal match against China that the Australian team ended up winning. She was named a member of the All Star team for the 2011 Canada Cup. In July 2011, she was a member of the Australian Stingers that competed in the 2011 FINA World Championships in Shanghai as a field player. In preparation for this tournament, she attended a team training camp in Perth, Western Australia. She competed in the Pan Pacific Championships in January 2012 for the Australian Stingers. In February 2012, she was named to the final training squad for the 2012 Summer Olympics. She attended training camp that started on 20 February 2012 at the Australian Institute of Sport. The team of seventeen players will be cut to thirteen before the team departs for the Olympic games, with the announcement being made on 13 June. She was part of the Stingers squad that competed in a five-game test against Great Britain at the AIS in late February 2012. This was the team's first matches against Great Britain's national team in six years.
