Molloy begun playing basketball from a young age, she played for Diamond Valley and Eltham during her junior years. During her senior years she played for Nunawading in the SEABL and Melbourne Boomers in the WNBL.
In 2015 she received the Melbourne Boomers Rookie of the Year award. In the same year, Molloy also was announced as a member of the 2016 Australian Gems squad.[3]
Molloy represented Victoria Country and Victoria Metro at state level six times, winning two national championships at the Victorian Under-20 and Ivor Burge Championships in Ipswich and Bendigo.
Molloy turned down any college scholarships to pursue her football dream.
Junior and state league football
In 2017 she played football both the Calder Cannons in the TAC Cup and Diamond Creek in the VFL Women's competition. She was well credentialled in both leagues, winning the TAC Cup's league best and fairest and leading goalkicker awards before tying AFLW Western Bulldogs star Katie Brennan for the VFLW's league leading goalkicker award.[1]
In her first year in senior football at Diamond Creek, Molloy took out the club's Leading Goal Kicker award, as well as Runner's Up Best and Fairest at just age 18.
She made her league debut in round 1, 2018 in a match against Carlton at IKON Park. She played in a defensive role, gathered a game high 20 disposals and was named by AFL Media as one of Collingwood's best players in the eight-point loss.[5][6] Molloy received a nomination or the 2018 AFL Women's Rising Star award for the performance.[7]
Molloy was the youngest player to also be selected in the 2018 AFLW All-Australian Team in the back pocket.
A week-and-a-half later, she also won Collingwood's AFLW best and fairest award,[10] as well as Best First Year Player award.
Molloy was also named the AFLPA's inaugural AFLW Players' Best First-Year Player Award in 2018.
In May 2018, Molloy was re-signed by Collingwood for the 2019 season.[11]
In September of that year she suffered a serious Lisfranc injury to her right foot while playing with Collingwood's VFLW team, the recovery from which saw her ruled out for the entirety of the 2019 AFLW season.[12]
For the 2019 season Molloy took on a new role working alongside Collingwood list manager and performance analyst Jess Burger as an opposition analyst.[13] She was also appointed part of the Collingwood AFLW leadership group ahead of the 2019 season.[14]
In April 2019, Molloy re-signed with Collingwood for the 2020 season.[15]
In March 2020, Molloy was selected by the AFL Players Association as captain of their inaugural 22under22 squad,[16] as well as being selected for a 2017–19 retrospective 22under22 squad.[17][18]
It was revealed in May 2021 that although premiership contenders Melbourne, premiers Brisbane, and new expansion club St Kilda had made attempts to sign her at their respective clubs, she decided to stay at Collingwood on a two-year deal.[22]
In February 2023, it was revealed that Molloy will leave Collingwood in the new Priority signing period, joining Sydney on a five-year contract.[23]
In September 2024, Molloy sustained a season-ending ACL injury.[24]