Trust was not something that was easily gained in the Inner Circle of the Death Eaters. One of her first lessons was to be very careful who she allied herself with. Too bad she made so many errors in judgment. Clearly Rodolphus had been the biggest mistake she could've made. She allowed the man to get too close to her and he used that to his advantage. And she still couldn't explain her issues with Draco. Why did she imagine for even a moment that he could ever be trusted? He had only been using her, manipulating her for his own gains. He hadn't made it a secret that he desired nothing more than a future where he could be proud of his family again. No doubt Rodolphus offered the Malfoys the ability to throw their lot in with him in exchange for the return of their prestige.