She is known for the local soccer's fastest in the Women's National Premier League 2019 for the FFSA NTC women's team with a speed of 10.04[1][clarification needed] After playing at the FFSA NTC, Mullan joined W-League club Adelaide United in October 2018.
[2] She played her first game with Adelaide United[3] in a 0–0 draw against Melbourne Victory coming on as a substitute for Emily Condon.
[citation needed] In March 2019, Mullan left the W-League and joined Adelaide University.
[6] In December 2020, Mullan returned to Adelaide United after scoring 3 goals in 17 appearances for Salisbury Inter in the 2020 Women's NPL.
[9] In January 2024, following five months not playing due to recovery from a meniscus tear, Mullan re-joined Adelaide United on a scholarship contract until the end of the 2023–24 A-League Women season.