Daphne knew she had to distance herself, she knew what Blaise would say. Yet the short witch could not, would not, do what she knew was right. She knew she would hate herself later, when she was alone in her bed with a silencing charm so the other didn't here her crying.
But right now, in this moment, the small witch knew what she wanted. and while she wouldn't act on it directly, she could push things in her direction "Come on then," she said heading inside "lets go have a private party in the empty boys dorms."