For the inaugural
2011–12 season of the
Women's National League (WNL), 16-year-old Mustaki joined
South Dublin club
Peamount United. Seen as a promising midfielder, she helped Peamount secure the league title in her debut season. Mustaki was one of several Peamount players to follow manager
Eileen Gleeson to
UCD Waves for
2014–15. In August 2014 Mustaki was diagnosed with
Hodgkin lymphoma and underwent
chemotherapy. When UCD Waves played in the 2014
FAI Women's Cup final against
Raheny United in November, UCD's
Áine O'Gorman celebrated her equalising goal by revealing a t-shirt with team-mate Mustaki's
squad number 17 on it. On 16 March 2015 Mustaki played her first football match since July 2014, when she came on as a
substitute for UCD Waves against Raheny United at
Morton Stadium. While based at
KEDGE Business School in
Bordeaux on an
Erasmus Programme placement, Mustaki played for
Girondins de Bordeaux. Mustaki spent a season with
Shelbourne in
2019, then signed for English
FA Women's Championship club
Charlton Athletic in November 2019. She made her debut in a 1–0
FA Women's League Cup win over
London City Lionesses. A serious knee injury sustained on international duty curtailed Mustaki's season in March 2020, just before the
COVID-19 pandemic prompted her London-based employer to allow her to work from home in Ireland. She rejoined Shelbourne for
2021. After helping Shelbourne win the 2021 WNL title and playing in the 3–1
2021 FAI Women's Cup Final defeat by
Wexford Youths, Mustaki agreed to remain with the club for
2022. In July 2022 Mustaki returned to English football, signing a one-year
professional contract with Women's Championship club
Bristol City. She made 14 appearances as part of the squad which won promotion to the
Women's Super League during the
2022-23 season. On 10 July 2025, it was announced that Mustaki had signed with
Nottingham Forest. ==International career==