No, what he did to her was not a spell. Despite there being many instances that she didn't understand her thoughts or feelings when she was around Draco, there were other times that she could see him quite clearly. He was an expert at building walls around himself. It took one to recognize another. When he was conscious in his efforts to remain aloof and unreadable, she would never be able to see what he didn't wish for her to see. Other times, when he was at his most emotional, she could see his barriers slip. Though she might never understand anything about the wizard if she had to spend every single moment of the rest of her life in his presence, she knew one fact that was absolute. He was very jealous of Antonin. Maybe because she'd spent twenty years living with a man who struggled moment by moment to control his prodigious jealousy she could recognize the signs. No matter how he tried to hide it, Draco was jealous of her husband. She didn't really understand why, just that he was.