No one really knows what exactly Marie-Thérèse was subjected to in the Temple when she was in solitary confinement for a year. The "memoirs" she wrote there were written under the surveillance of a revolutionary spy; Marie-Thérèse later disowned them. (Changing the "story" is also common to those who have been through trauma, as over the years they come to remember more that they blocked out and understand more about the implications of the terrible things that occurred in youth.) Before Madame Elisabeth was killed, she begged her niece Marie-Thérèse never to let the guards find her undressed or in bed. Since the guards would make surprise visits to her cell at all hours of the day and night, the 16-17 year old princess, Madame Royale of Versailles, would sometimes spend the night in a chair, terrified. (See Memoirs of the Duchesse de Gontaut)
When restored to France and the Tuileries in 1814, Marie-Thérèse wanted everything to be exactly as it was when she had last been there with her family, which was of course, impossible. She was subject to nightmares and hysterical episodes when something would by chance remind her of her family's ordeal. Sometimes she would be heard pacing all night. She tried to reverse the gossip about her mother by her own excruciatingly correct deportment and charitable activites, preferring hospitals and orphanages to the ballroom and the opera box. However, due to propaganda, by 1830 she was called "Madame Rancune" or "Lady Resentment."
She never had any children due to her bizarre and unhappy marriage, but loved her niece and nephew, Louise d'Artois and the Comte de Chambord, as her own. It was a sad life, but a courageous life, too. She did a lot to rebuild France after all the country had been through with the Revolution and Napoleonic wars.