After joining Arsenal on an initial short-term contract in May 2017, she extended her terms and helped the North London club recapture the FA WSL title in 2018–19.

After a break from Gaelic football, Quinn returned to playing with Kilcullen GAA at around 18 or 19 years old, alongside her best friend and Peamount United team-mate Jenny Murphy.

[4] Quinn began playing organised soccer with Blessington Boys' at under-6 level, alongside her friend Derek Balfe and his father Vincent, who coached the team.

[9] In August 2011, Quinn scored a hat-trick against ŽNK Krka, as Peamount won 7–0 in the UEFA Women's Champions League qualifying round in Slovenia.

[14] In February 2017 Quinn signed for Notts County,[15] only for the club to fold in April just before the start of the FA WSL Spring Series season.

[20] After a 2020–21 season in which Fiorentina finished fourth in the League and were beaten 2–0 by Juventus in the Supercoppa Italiana final, Quinn declined her one-year option and decided to leave the club.

[25] As Quinn had a relegation release clause in her contract she sought assurances from the club about promised improvements to their training facilities before deciding whether to stay on.

[26] Ultimately Quinn decided to remain with Birmingham City in the second tier, explaining that she enjoyed the club's Irish connections and working under coaches Darren Carter and Jo Potter.

[2] Quinn made her senior bow in February 2008, as a last-minute substitute for Niamh Fahey in a 4–1 friendly win over Poland at John Hyland Park in Baldonnel, Dublin.

[31] After securing a regular position in the centre of Ireland's defence, Quinn was named the FAI Senior Women's International Player of the Year in 2013.

[3] Quinn continued to be selected by national team coach Susan Ronan and participated in Ireland's failed 2015 FIFA Women's World Cup qualification campaign.

On 5 April 2014 in a fixture against Germany at Tallaght Stadium, Quinn's header from Megan Campbell's long throw-in secured a 1–0 lead at half-time.

Her winning goal in a 3–2 friendly victory over Australia on 21 September 2021 at Tallaght Stadium arrested a seven-match losing run stretching over 18 months.

[41] In September 2022 she declared that Ireland had shed their "Spursy" label, after much improved results secured the team's place in the 2023 FIFA Women's World Cup qualification – UEFA play-offs.

Her condition also made her exempt from mandatory Irish language classes at school, although patriotism led her to continue the subject and gain a pass mark at Leaving Cert level.