She repeated his name multiple times just in case he was inside. Known for being a heavy sleeper, a trait so few Death Eaters possessed, it was often joked that Thorfinn could sleep through the Hogwarts Express passing through his bedroom. Satisfied that she was indeed alone, she went straight to his bedroom. If Thorfinn wasn't with her husband, he would most likely know where he could be found. She was ready to demand Antonin give her one of his enchanted mirrors just for her own peace of mind. It wouldn't even matter that others could witness their conversations. Rodolphus had to have known by then that she was back with Antonin. Maybe that's why she had such a strong worry in her guts.