Sietse studied theatre sciences and afterwards obtained a Bachelor of Music focusing on musical theatre. Following those studies she graduted as a Bachelor of Drama. In Flandres she performed with Het Niewstedelijk and toured with LAZARUS. In the Netherlands Sietse acted in Flikken Maastricht, Hema de Musical and Kom hier dat ik u kus. Aside from her work as an actress and singer she also is a playwright and works as a dramaturge for various young theatre makers.