As for the others? Let them tear each other apart while digging into Hera's words and chasing shadows. It didn't matter; she had just received the go signal from her grandfather. That alone meant he was nearly done with his part of the plan and had already moved to secure her position behind the scenes.
Hera didn't have much to worry about; her grandfather had her back. Silvia, on the other hand, might soon have to start packing: her role as a stand-in was coming to an end. Had Silvia kept quiet and behaved, she might have been allowed to remain a placeholder while Hera strengthened her position in the business world.
But by provoking Hera and making herself a continuing problem, she'd forced Hera's hand. It was far better to deal with Silvia now than to let her linger and cause trouble again and again; doing so would only bring Hera more headaches down the line.