If she could somehow get her husband to go along with the Resistance's plan, she might be successful. Antonin had a number of loyal followers who would do whatever he asked. There was a valid reason why the Dark Lord practically gave him everything his heart desired. Lord Voldemort was doing what he could to keep Antonin happy. The happier he was, the less likely it was that he would stage a coup d'état. Their master was painfully aware of his shortcomings. His time was eventually going to come to an end. He was wise to do what he could to make sure it wasn't hastened.