I must confess that now I am the one, who is not too well informed about any russian or hessian connections of Marie Antoinette. People have sooo many ansistors, but I give you the advice to check out the wonderful page genea Portugal. It is one of my favourite genealogy sites. It´s wonderful, how you can lead the people back in their ancestry. I always use that page, and there you see all ansistors of the Habsburgs, like those of Maria Antonia (=Marie Antoinette). From her mothers side it can be that she hads hessian blood, surely, I have to check out the page again by myself, I already looked there several times, to see the ancestry of empress Maria Theresia, and you find everything there. About the Romanovs I do not know very much I must confess, because I was always concerned with the others, especially with the Habsburgs and Bonapartes. Yes, Marie Antoinette´s grandniece was also queen of France. It was Marie Louise of Austria, daughter of emperor Franz II./I. , himself son of Marie Antoinettes brother Leopold II., firstly reigning in Tuscany and then also following his "illuminated" brother Joseph II. as holy roman emperor. Napoleon Bonaparte (Napoleon I.) married Marie Louise in his second marriage, it was a political marriage, but also because his first wife Josephine could not give him any heir. Their son was Franz von Reichstadt was quite unlucky, lived under some of arrest by the austrians, he grew up at the Habsburg court and died with 21 at tuberculosis. Please check out our topics about Marie Louise and Franz. I would be happy, if they will be read again, also new comments would be great, because at the moment those topics seem to be out of interest

Marie Louise also had two children by Montenuovo: Wilhelm Adalbert und Albertine. Please have a look on the thread, where I also posted one of my drawings on the last descendant of Albertine, Giovanni Sanvitale
And about the daughter of Marie Antoinette: Marie Thérèse, was never considered as queen, she was married to her cousin Louis-Antoine de Bourbon-Artois, duke of Angoulême, but they never had children. Some mythology wants to say that Madame Royale was "exchanged" by a halfsister, who appeared to marry Louis Antoine, and the real Madame royale lived somewhere in obscurity, but this is rather a thesis based on mythology and suspicion.