Her family claimed ancestry from the reigning Dukes of Brittany and at the French court, were allowed the rank of Foreign Princes.

Appealing to the Queen Regent Anne of Austria, in 1645 Louis XIV issued a certificate that willed Marguerite the right to keep her status, her dignity of a princess, should she marry Henri de Chabot.

Previously, her hand had been asked by Louis de Bourbon, Count of Soissons and cousin of the King Henri IV; she refused.

By her marriage, she brought her dowry to her husband as well as all her possessions and titles, with the condition that the children bear the name and coat-of-arms of Rohan only.

Marguerite has various descendants throughout Europe; Through her son she is a direct male line ancestress of Josselin de Rohan, member of the Senate of France.