When Paine submitted his 'Letter' to his friends Brissot and Condorcet to publish as an advertisement for their new paper Le Républicain, it needed to be translated. Paine spoke and read French, but didn't like to write it. It had been decided, for some reason, that Achille Duchatellet, not Paine, would sign the article before it was pasted all over Paris, and published first, in Brissot's Patriote François, and then as the leading article of Le Républicain. Etienne Dumont, translator of of Jeremy Bentham, was approached first. Dumont refused, on the grounds that he did not want to be involved in what he saw as a foolhardy enterprise by 'an American and a young fool from the French aristocracy who put themselves forward to change the face of France' . The other member of the team who was able to translate was Sophie - hence, she probably got the job.
But Sophie's participation in the journal did not end with translation. Two anonymous articles may be attributed to her. The first is very short. Entitled "Letter from a young mechanic" it proposes that the royal family and its entourage be replaced by a set of automaton. Even though such machines are expensive, they will cost a fraction of what the French people are spending on their actual king. And what's more, the mechanical king, far from being a tyrant, will raise its pen and sign everything its government wants it to!
The second article is a long and very critical piece on the King and the mechanisms of his government. This article, it seems, was originally supposed to be written by Dumont, but he withdrew, when the king was returned to Paris. Dumont, however, had left a set of notes at the Condorcet. He later complained in his memoires:
There is good stylistic evidence that the person who 'rewrote' Dumont's piece was in fact Sophie. In particular, an image she uses in her Letters on Sympathy can be found in the article, that of the king (and monarchy) as a rattle designed to amuse the immature French people, to distract them from the fact that they are not free.