They had one son, Jules Gabriel Timoléon, who died as a toddler, and one daughter, Adélaïde-Pauline-Rosalie, who lived to adulthood, married Victurnien de Rochechouart, Duke of Mortemart, and had several children of her own.
Despite having du Barry to thank for her office, she refused her invitations and demonstrated her loyalty to the crown princess, which resulted in a chain of court scandals.
In 1771, Marie Antoinette was not yet interested in fashion, and the financial disorder of her household was the result of the neglect by Adélaïde Diane de Cossé's predecessor in the office.
The private economy of Marie Antoinette's wardrobe was not to be met with any restrictions until de Mailly's successor, Geneviève d'Ossun, took office and started to work towards curbing it.
Adélaïde Diane de Cossé spent the majority of the following years in Italy and in Nice, at that time a part of Savoy, as the warmer climate was judged better for her health.
She successfully applied to have herself removed from the emigrée list on the grounds that she had never emigrated during the Revolution, and to have her confiscated property restored by recommendation of General Joubert.