[1] Catherine's sister, Sophia, also had a female dwarf as personal attendant: Agnieszka, whose position mirrored that of Dorothea.
[1] During the four years long captivity, Dorothea is noted to be by Catherine's side when she walked the gardens, when she was given permission to leave the Castle and visit a spring, and when she gave birth in prison.
Dorothea upheld a correspondence with the sister of Catherine, Sophia Jagiellon, Duchess of Brunswick-Lüneburg, and has left some writings which provides a source of information of contemporary Sweden.
[3] Her correspondence describes the contemporary political situation in Sweden and provides insight into her own influential position as a favored confidant.
Her favored position is also revealed in the great care, privileges and concern the queen showed her while she (Ostrelska) was at one point taken ill.