There was no mistake that her loyalty lied in full with Edric, no matter which version of the Dark Lord was present. She had seen his demise, she had lived through months under his surveillance and been forced to show hospitality. Unless she would require the Dark Mark here...she saw no reason to exert loyalty in others.
And while Damien's charisma may have sparked something within the Lady Malfoy, Edric had ensnared her entirely. Her breath hitched softly at his touch, her body reacting as she leaned back into him, listening to all he had to say. "But is it not wise to considering that some of those..." well they weren't all Muggles... "Beings could be of some potential? Perhaps there is something to be learned from a witch of another world or another Lord."
Of course he had noticed the exchanged between Damien. She felt a twinge of guilt, looking straight ahead. "He seems to have this...unnatural charm about him. He claims to be the Muggle's Antichrist." Was that sufficient enough to excuse her behaivour? There could be a chance he had bewitched her or...something.