Considering that she was in Vienna for nearly three years before the Holy Roman Emperor sent her on to her uncle and her match with her cousin, the duc d'Angoulême, Marie Thérèse Charlotte de France, daughter of Louis XVI and Marie Antoinette, a match was proposed several times with the duke of Teschen (and sometime last governor of the Austrian Netherlands).
The corrollary to this match was that the duc d'Angoulême would be compensated for his lost bride by marriage to the emperor's sister, the Archduchess Maria Amalia (b. 1780) who would be given several border counties in the Netherlands as her dowry. Unfortunately, Maria Amalia decided she didn't like the idea of being another l'Autrichenne and went and died in the following year. Franz II attempted to rescue the situation by offering another Habsburg archduchess (probably his only unmarried sister, Maria Anna (b. 1770)), but Louis XVIII had an ally in his niece whom he had tricked (her into thinking that the match with Angoulême was what her parents had wanted) by sending her love-letters supposedly from Angoulême.
Say Marie-Thérèse is married off (whether willingly or by force) to her Austrian cousin, and his sister is sent to marry Angoulême (his childlessness might not necessarily be affected by a different bride though). What might this mean for the relationship between Austria and France for the remainder of the Revolutionary-Napoleonic Wars? What does the future hold for Marie-Thérèse?