This is her very brief Wikipedia article, "Béatrice de Cusance (1614–1663), was a duchess consort of Lorraine; married 1637 to Charles IV, Duke of Lorraine.
Issue:
Francis de Lorraine (1637 † 1638);
Anne de Lorraine. (1639 † 1720), married her cousin François Marie de Lorraine (1624 † 1694), Prince of Lillebonne in 1660,had issue;
Charles Henri de Lorraine (1649 † 1723), Prince of Vaudémont and of Commercy."

Beatriz Cusance, secret second wife of Charles IV, Duke of Lorraine after Sir Anthonis van Dyck (location unknown to gogm)

1635 (?) Béatrice de Cusance, princesse de Cantecroix, duchesse de Lorraine, par Van Dyck (Royal Collection)
