After her son took over government in 1728, she retired to her Wittum seat of Eisfeld, where she died on 4 September 1742.
Despite the age difference, it was obviously a marriage without insurmountable conflicts, perhaps because Eric mostly stayed on his Erichsburg and Calenberg Castle, while Elisabeth resided at her wittum Münden.
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Elisabeth managed to force Eric into giving her a more profitable wittum than their marriage contract required: instead of the district of Calenberg in the Unterwald region, which contained Calenberg Castle, Neustadt and Hanover and provided little revenue, she received Oberwald, with the towns of Münden, Northeim and Göttingen, which provided more revenue and greated political weight.
After her husband's death Mary, who had been promised the district of the Pudagla as her Wittum, initially continued living at Wolgast Castle.
In addition Salomea received the town of Łęczyca, several castles and towns throughout Poland (including Pajęczno, Małogoszcz, Radziejów, Kwieciszewo) as her Oprawa wdowia (Widow's seat or wittum); this was the first documented case where a Polish ruler left his widow her own piece of land.
After he retired, Wittum taught driver's education classes at Grayslake Central High School in Grayslake, Illinois.