Hermione even rearranged the incident with the freezing curse to make him believe once again that it was just an angry wandless outburst, one he deserved. From the memories she just implanted, she removed anything incriminating; she just wanted to leave him with her bad feelings. But he would no longer suspect Malfoy of using magic or question his involvement with the wand official. He would have no memory of the flowers wilting and dying at the dance. He would not offer to present his memories to the Wizongamet because he had nothing of substance or value.