The family returned to Wexford and Jarrett began playing football for North End United's boys' team alongside her twin brother Jordan and their cousin Robin Dempsey.
[5] After suffering a serious knee injury in January 2015 Jarrett quit her American studies, switching to the Institute of Technology, Carlow and taking a job with Equifax in Wexford.
[7] In June 2019 she scored five times in Wexford Youths' 6–2 win at Galway WFC, amidst reports that her "sensational form" had brought her to "the verge of a step up in level".
[20] In May 2018, Ireland coach Colin Bell recalled Jarrett to the squad for a FIFA Women's World Cup qualifying fixture against Norway.
[22] She scored her first international goal on 8 October 2019, in Ireland's 3–2 UEFA Women's Euro 2021 qualifying Group I win over Ukraine at Tallaght Stadium.