She functioned as art patron and exerted significant influence over her husband, especially over his relations with church officials, which earned her considerable notoriety in monastic circles.

[2] At that time, King Tvrtko II of Bosnia found that his vassals' opposition to his close ties with the neighbouring Kingdom of Hungary was putting his throne in jeopardy.

[2][3] The sources reporting these marriage negotiations are also the only ones that mention Dorothy by name, which is why historians were for a long time uneasy about identifying her as Tvrtko's wife.

[2] All information about the royal wedding comes from the documents issued by the institutions of the Republic of Ragusa; the Ragusan patricians were keen to learn as much as possible about the Bosnian King's bride.

[1][4] The new queen may have accompanied her husband on his visit to the Kosača family seat in Blagaj, intended to mend the relations between the vassal and the overlord, in the spring of 1429.

The Ragusan authorities addressed the Queen as well as the King, and they made effort to flatter her by sending expensive gifts and emphasizing her family's traditionally close relations with the Republic.

[2] In 1432, Pope Eugene IV sent Saint James of the Marches to reform the Franciscan Province of Bosna Srebrena and eradicate the Bosnian Church.

[3] The marriage of Dorothy and Tvrtko was certainly contracted for political reasons, but Ragusan reports about their wedding festivities and her death, which took place between 19 and 24 September 1438, indicate that the King had genuine affection for his wife.