Yvonne wouldn't take issue with The Brotherhood's control of Corone, albeit she might find the timing of their coup to be distasteful especially if it's first chapter - while she helps to evacuate terrified Coronays onto ships. Her merchant guild contacts are based there and will be loading and transporting goods for relief and support of innocent people. If The Brotherhood was to lock down the city, seize stockpiles of food and cloth or blockade the harbour she'd take issue but wouldn't have time to deal with them until much later.