Catherine was raised in Brandenburg, but lived with her mother in Sweden for several years after the marriage of her sister Maria Eleonora to king Gustavus Adolphus of Sweden in 1620.
Katharina dibesarkan di Brandenburg, namun tinggal bersama ibundanya di Swedia selama beberapa tahun setelah pernikahan saudarinya, Maria Eleonora dengan Raja Gustavus Adolphus dari Swedia pada tahun 1620.