[4] Folkertsma made her league debut against PEC Zwolle on 21 August 2015.

[13] In June 2021, while she was preparing for the 2020 Olympics it was revealed Folkertsma had agreed contract terms with French club Bordeaux.

[18] She will share captain duties with Jacintha Weimar and Esmee de Graaf from the 2024-25 season.

[21] She was a member of the team that became champions at the UEFA Women's Euro 2017.

[22] After the tournament, the whole team was honoured by the Prime Minister Mark Rutte and Minister of Sport Edith Schippers and made Knights of the Order of Orange-Nassau.