Hermione's first instinct was to argue. The words were coming out of her mouth at a rapid rate before she even had much of an opportunity to think them through. Not working was not an option. If she agreed with her husband's proposed solution, she would lose any chance at all of freeing Aberforth from the prison she was responsible for him being in. She wasn't prepared yet to give up hope that it was possible. Expecting any kind of future where the Resistance still clamored for her blood wasn't a good one.