Born in Melbourne, Gielnik moved to Queensland at the age of seven. After stopping basketball due to injuries she took up soccer and was eventually signed by Brisbane Roar for the second season of the W–League.[1] At Brisbane she became recognised as a "super sub" for her knack of coming off the substitutes' bench to score late goals.[2] Gielnik played eight seasons at Brisbane, appearing in 83 games and scoring 30 goals. She won the W-League Championship in 2010–11 and the Premiership in 2012–13 and 2017–18.[3]
Liverpool LFC and Ottawa Fury, 2012–2013
In May 2012, Gielnik signed for English club Liverpool L.F.C., during the 2012 FA WSL season.[4] In October 2012, she was one of ten players to be released by Liverpool's new manager Matt Beard.[5] In 2013, Gielnik joined Ottawa Fury for their W-League season.[6]
Gielnik joined Norwegian team Avaldsnes IL for the 2017 season. She had a breakout season with the team, scoring eight goals in league play. Avaldsnes finished second in the Toppserien and won the Norwegian Cup.[8]
On 23 August 2019, Gielnik joined German Frauen-Bundesliga club Bayern Munich.[11] In July 2020, she left the club after making only 6 appearances, partially due to injury.[12]
Vittsjö, 2020
A week after leaving Bayern Munich, Gielnik signed with another European club, joining Swedish club Vittsjö.[13]
Brisbane Roar, 2020–2021
In November 2020, Gielnik returned to Australia, signing with her hometown club, Brisbane Roar.[14]
Gielnik scored a hat-trick on her international debut for Australia U-19s in October 2011.[1] She made her first appearance for the senior Matildas team in a 3–0 friendly defeat to World champions Japan in Tokyo on 11 July 2012.[18]
In May 2019, Gielnik was named to her first World Cup team.[22] At the World Cup Gielnik appeared in three matches for Australia, starting two of them. In the Round of 16 against Norway, she entered the match as a second-half substitute replacing Hayley Raso. With the match tied 1–1 after extra-time, the game went to penalties. Gielnik was the second penalty taker for Australia, she had her penalty saved. Australia lost to Norway 4–1 on penalties and were eliminated from the World Cup.[23]
Gielnik was selected for the Australian women's footballMatildas soccer team which qualified for the Tokyo 2020 Olympics. The Matildas advanced to the quarter-finals with one victory and a draw in the group play. In the quarter-finals they beat Great Britain 4-3 after extra time. However, they lost 1–0 to Sweden in the semi-final and were then beaten 4–3 in the bronze medal playoff by USA.[24]Full details.