Madame de Polignac and the Politics of Calumny by Elena Maria Vidal, via the Catholic Writers Guild Blog:
The closest confidante of Queen Marie-Antoinette was Madame de Polignac. Gabrielle de Polastron, Duchesse de Polignac, also referred to as “Yolande,” is usually portrayed in books and films as Marie-Antoinette’s “bad girl” friend, responsible for leading the young queen of France into a wild, decadent lifestyle. Often depicted as a greedy, spendthrift slut, Gabrielle preferred simplicity, was a devoted mother and loyal friend of both Louis and Antoinette. Part of the rehabilitation of Marie-Antoinette’s reputation is a careful look at her relationship with Gabrielle.