With the death of her stepson Ulrich II the Mecklenburg-Stargard line died out and the indebted country fell to Mecklenburg-Schwerin, which was not responsible for the maintenance of Stargard's widow.
The dispute between the houses of Brunswick-Lüneburg and Mecklenburg-Schwerin about her jointure at Plau am See dragged on until her death.
In 1499 she was, under pressure from the Dukes of Brunswick, admitted as a permanent resident to Wienhausen Abbey.
She was financially supported by her sister-in-law Anne, the widow of her brother Otto V, who sent her only 12 guilders per year.
From her marriage Margaret had two daughters: This article about a German duchess is a stub.