Originally raised in the Lutheran faith, in 1611 she converted to the Catholicism, together with her whole family. On 13 July 1617 her father, Adam Wenceslaus, died and was succeeded by his only surviving son, Frederick William. On 23 April 1618 Elizabeth Lucretia was married against her will with the also ex-Lutheran Gundakar of Liechtenstein, a widower almost twenty years her senior. Gundakar was a younger brother of Karl I, Duke of Opava and Krnov, one of the members of the Regency council who ruled the Duchy of Cieszyn during Frederick William's absence; however, this arrangement was short-lived, and the de facto rule was held by Elizabeth Lucretia, even after Frederick William returned to Cieszyn and assumed the effective government in 1624, because the Duke almost immediately after his return made a trip with the Emperor to the Netherlands. During this journey, Frederick William became suddenly ill and died on 19 August 1625 in Köln, unmarried and without legitimate issue. Initially, Emperor Ferdinand II tried to join Cieszyn to his domains, using his rights as King of Bohemia; but the end, he accepted Elizabeth Lucretia as reigning Duchess, by right of the Privilege granted by King Władysław II Jagiellon to Duke Casimir II of Cieszyn in 1498, under which was secured the female succession over Cieszyn until the fourth generation. During her reign, Cieszyn passed through one of the most difficult periods in his history. It was the Thirty Years' War, during which Cieszyn was regularly plundered by foreign forces, both in terms of infrastructure and finances. In addition plague and hunger also affected the Duchy and many citizens died. Eventually, this led to Cieszyn being economically and demographically destroyed for the next 100 years. Elizabeth Lucretia's life was seriously threatened on several occasions: for example, in 1642, when she had to find refuge in Jablunkov and in 1645, when she escaped to Kęty, after the Swedish forces took the capital. Only the Peace of Westphalia on 24 October 1648 finally established the peace in her domains. The marriage of the Duchess with Gundakar of Liechtenstein proved to be unsuccessful, despite the fact that they had three children together. In 1626 they were formally separated, and remained in this way until her death. Elizabeth Lucretia died on 19 May 1653 and was buried in the Ducal crypt in the Dominicanchurch in Cieszyn. After her death, the Duchy of Cieszyn reverted to the Bohemian Crown as a completed fiefdom and was onward ruled directly by the Bohemian kings, then members of the House of Habsburg. Subsequently, Habsburg dynasty bore the title until the fall of the Empire and the liquidation of the Duchy of Cieszyn in 1918.
