Frazer was a member of the Maryland Terrapins team that won the 2010 and 2011 NCAA Division I Field Hockey Championships.

[7][8][9] Between 2001 and 2009, Frazer attended Foyle and Londonderry College, where she played field hockey, cricket and touch rugby.

[2][7] In the Ulster Senior Schoolgirls' Cup final, Frazer scored the only goal as Foyle and Londonderry defeated Ballymena Academy 1–0.

[12] In 2007–08 Frazer was a member of the Ballymoney team that finished as runners up to Pegasus in both the Ulster Shield and the Irish Senior Cup.

[2][3][4][6][11] In 2013–14 Frazer played for Holcombe in the Women's England Hockey League, helping the club gain promotion to the Premier Division.

Her teammates at Holcombe included Nicola Daly, Steph Elliott, Lucy Wood and Maddie Hinch.

[31][32] In March 2015 Frazer captained the Ireland team that won a 2014–15 Women's FIH Hockey World League Round 2 tournament hosted in Dublin, defeating Canada in the final after a penalty shoot-out.

However she returned in time to represent Ireland at the 2018 Women's Hockey World Cup and was a prominent member of the team that won the silver medal.