Marie-Antoinette of Austria married the Dauphin in the same year that Madame Louise entered the monastery. The young princess offered to represent Louis XV at the ceremony at which his daughter Louise received the habit of Carmel, since it was too painful for the king and the rest of his family to be present. So it was the teenaged Marie-Antoinette who veiled the new "Soeur Thérèse de Saint-Augustin."
In the years the followed, Marie-Antoinette would visit her husband's aunt three times year at the Carmel, of which she was a benefactress. As the Queen's maid Madame Campan relates in her Memoirs:
The Court went to visit her about three times a year, and I recollect that the Queen, intending to take her daughter there, ordered me to get a doll dressed like a Carmelite for her, that the young Princess might be accustomed, before she went into the convent, to the habit of her aunt, the nun.According to Madame Campan, Madame Louise as a nun was deeply involved in church affairs; she was always petitioning her nephew's wife, so that Marie-Antoinette called her: "the most intriguing little Carmelite in the kingdom." It was at the request of Madame Louise, however, that Marie-Antoinette granted a dowry to a poor, pious girl named Mademoiselle Lidoine, so that she could enter the Carmel of Compiègne. Mademoiselle Lidoine became the Mother Prioress of the heroic Martyrs of Compiègne, who like Marie-Antoinette, died on the guillotine during the French Revolution.