Central midfielder Seren signed for City in the summer of 2021 from Pontypridd Town.
She is a Wales U19 international.
Iain Darbyshire, Head of Women's & Girls' Football at Cardiff City Football Club: “Seren has become a really important part of our team after joining last season. She had a fantastic first year with us and we were really happy for her to score her first goal for us in the cup final against Cardiff Met. She improved a lot between the start and the end of the season and we’re excited to see that continue this year.”