The problem was, that he was her  soulbond, her whole body yearned to be near him even if her mind knew better and she had noticed the same from him. They were drawn to each other like magnets, an invisible string tied around their waists tugged them closer and closer till their brains caught up and realised. It was all incredibly frustrating for her but made slightly better by the fact that Malfoy was still in the dark about it. 