If she stopped to really consider the implications of what Draco was saying to her about the secret alliance he had with her husband, she felt mortified. Was Antonin aware of everything that she'd done when she was on the run? Or how about after she was back in Hogsmeade pretending to be a dutiful wife? Even though she was extremely curious, she was afraid to ask Draco how much Antonin knew. She was afraid that she wouldn't like the answer.