The 23-year-old all-rounder replaces the Western Province duo of Lara Goodall and Delmi Tucker on the 15-player list.
Led by captain Laura Wolvaardt and head coach Mandla Mashimbyi, the Proteas Women are gearing up for a significant year ahead with Women's World Cup set to take place in India later this year.
CSA Executive: National Teams and High Performance, Enoch Nkwe commented: "It's a momentous occasion for Annerie Dercksen, whose performances have been impressive as she cemented her spot in the team, earning a well-deserved first national contract.
"The continuity in the squad also recognises the team's outstanding achievement in reaching a second consecutive World Cup final, highlighting CSA's commitment to rewarding consistent performance and building on the teamâs recent success on the global stage.
"As we prepare for a pivotal year with the ICC Women's Cricket World Cup in India, this squad offers the right balance of experience and youthful energy. We believe this group is well-equipped to compete at the highest level and continue making the country proud."
Proteas Women's contracted squad: Anneke Bosch (Titans), Tazmin Brits (Lions), Nadine de Klerk (Western Province), Annerie Dercksen (Garden Route Badgers), Ayanda Hlubi (Dolphins), Sinalo Jafta (Lions), Marizanne Kapp (Western Province), Ayabonga Khaka (Lions), Masabata Klaas (Titans), Sune Luus (Titans), Eliz-Mari Marx (Titans), Nonkululeko Mlaba (Dolphins), Tumi Sekhukhune (Lions), Chloe Tryon (Lions) and Laura Wolvaardt (Titans)