Whilst Prys played rugby union with her siblings on the family farm, she only began to take up the sport seriously when Nant Conwy formed an under-18s team in 2014. She worked as an apprentice for the Welsh Rugby Union and Urdd. Prys made her international debut for the Wales women's rugby union team, coming on as a second-half replacement in the national side's first round 2017 Women's Six Nations Championship match against Italy, which Wales won 20–8. Prys was named to the Wales side for the 2017 Women's Rugby World Cup. In late January 2019, she sustained soft tissue damage and a cut on her head in an road accident at approximately while travelling with teammate Bethan Davies to Cardiff to train, ruling her out for the whole of the 2019 Women's Six Nations Championship. Prys recovered enough to play in the November 2019 international matches against Ireland in Dublin and was omnipresent in the Wales national team for the remainder of the year and the 2020 Women's Six Nations Championship. Overall, Prys has played 15 times for Wales.