Because Grotius could not safely visit the Dutch Republic, Maria was often called upon to manage his affairs there. She took care of the contacts with his Dutch publishers, and also started several lawsuits to undo the forfeiture of his assets (and hers, because her considerable wealth was in their community property that had been seized in its entirety). For her own property she was successful in 1625 (after the death of Maurice and the appointment of his half-brother Frederick Henry, Prince of Orange as the new stadtholder), while the forfeiture of Grotius' assets was lifted in 1630.