Knowing that she might very well have as brutal a death as Amycus" awaiting her back in Hogsmeade, she knew that she needed to be vigilant where Draco Malfoy was concerned. He could be trying to lure her into a trap. Trying to force her into claiming out loud that her loyalties were no longer with the Dark Lord. She had no master beyond her own survival. There was no room for another when that one was so demanding.