From 1250 to 1256, she acted as Regent of La Marche and Angoulême for her son, Hugh XII of Lusignan.

Her father and brother also granted her the title of suo jure Countess of Porhoet.

[7] As in the case with King Henry and John of France, this betrothal to Theobald also did not result in marriage.

Yolande's husband Hugh XI was killed at the Battle of Fariskur in Egypt on 6 April 1250.

Yolande acted as Regent of La Marche and Angoulême for her eldest son Hugh from 1250 to 1256.

Upon her death, her Breton ennoblements returned to the House of Dreux when the titles of Count of Penthievre and Porhoet were seized by her brother, John I, Duke of Brittany.