Parfitt made her debut for Wales in 2007 against Worcestershire in the County Challenge Cup.[5] In 2011, she was her side's leading run-scorer in the County Championship, with 132 runs.[6] In 2013, she hit her maiden half-century for the side, scoring 52 against Devon.[7] In 2014 she took her maiden five-wicket haul, taking 5/20 from 10 overs before hitting 31* in Wales' 9-wicket victory over Worcestershire.[8]
In 2015 she was the ninth-highest run-scorer across the County Championship, with 268 runs including her maiden List A century, 109* made against Essex.[9][10] She was also her side's leading run-scorer in the 2015 Women's Twenty20 Cup, with 161 runs.[11] In 2016, Parfitt was her side's leading run-scorer across both competitions.[12][13] Parfitt became captain of Wales in 2017, and led the side to promotion to Division 1 of the Twenty20 Cup in 2018.[14][15] In 2019, she scored 177 runs in the County Championship, including two half-centuries.[16] In 2021, Parfitt was Wales' leading run-scorer in the 2021 Women's Twenty20 Cup, with 149 runs including 70*, made against Somerset.[17][18] She played seven matches for the side in the 2022 Women's Twenty20 Cup, scoring 80 runs and taking 7 wickets.[19] She played five matches in the 2023 Women's Twenty20 Cup, scoring 115 runs including one half-century.[20]
Parfitt was also in Western Storm's squad in the Women's Cricket Super League in 2017 and 2018, but did not play a match for the side.[21][22]
In 2020, Parfitt returned to Western Storm for the Rachael Heyhoe Flint Trophy. She appeared in 5 matches, scoring 89 runs at an average of 22.25, with a high score of 33*.[23] In 2021 she was retained in the squad, and scored 91 in a Rachael Heyhoe Flint Trophy match against Central Sparks as well as taking 3 wickets at an average of 27.66 in the Charlotte Edwards Cup.[24][25] She played one match for Western Storm in 2022, against Lightning in the Rachael Heyhoe Flint Trophy, scoring 9 runs and taking two wickets.[26][27]
In 2025, Parfitt joined the new Glamorgan women's cricket team[28] and was named captain in April 2025.[1][2]