They were in France theoretically conducting an investigation to uncover a pocket of Resistance members that had fled the country. The Dark Lord didn't want any of his subjects to run away from him. It was an important mission that she took quite seriously at first. Some of the Resistance were former Dumbledore's Army members. She wanted to prove to them that there was a place for them back home. If she, "Harry Potter's Mudblood', could find favor with the new regime, it was possible for each of them to as well. Too many had already been killed or publicly executed. Hermione wanted nothing more than to save them from the same fate.