Only in 1581 was her mother, Charlotte de Bourbon, reconciled with her father and, when she died prematurely it was this French grandfather who asked for Flandrine to come to him in France. However, her grandfather died in September 1582 and she was then looked after by Jeanne de Chabot, Abbess of Paraclet de Quincey, a cousin of Charlotte de Bourbon. But then, as this Abbess had Calvinistic leanings, it was Flandrine's maternal aunt, Jeanne de Bourbon, Abbess of Jouarre, who asked the French King, Henri III, to be allowed to take control of Flandrine's education. As a result Flandrine became Catholic and, on 21 November 1593, entered a convent. Several of her paternal relations objected without result. In 1595 the deaf Flandrine became Grand-Prioress of Sainte Croix and, on 25 July 1605, Abbess of this convent. Flandrine worked hard to have the strict rules of St. Benedict

enforced but founded a small priory, at Sables d'Olonnes, for elderly and sick nuns, were the rules of St. Benedict were relaxed. However, Flandrine remained in touch with her relatives, especially her sisters Elisabeth and Brabantine as well as with her step-mother, Louise de Coligny. She also tried to induce her sisters to convert to Catholicism and, in December 1627, the nuns of Sainte Croix prayed for forty continuous hours for Brabantine's conversion. Flandrine died in her convent on 10 April 1640. During the period that Flandrine was Abbess, the number of nuns had increased from thirty to ninety. 
 

Source: Leo van de Pas