Jedrek might not want her, the beast inside him was different. It was the beast who had a feeling for her. The beast wanted her, lusted for her, and Jedrek couldn't dismiss the beast's desire for his mate. And that was how she understood from what he just said earlier. Thus, Lilac would bet on this.
If I couldn't fight him, or get to his soft side, maybe I could try to win him through his beast?—she thought, calculating the possibility in order to get what she wanted from his beast. Lilac could feel Jedrek's body tensed up because of their closeness, and she knew right away that she was the cause of it.