The biggest problem, is that she made Draco alter her memory. It was painful and hard but they managed to cut out the part of her casting the curse. Instead they showed through Hermione's eyes how she ran away after the attack, managing to escape Ron without any magic involved. Altering memories is even more harder than taking them away.After that Hermione even fainted in his hands and he had to carry her to their bed, feeling light-headed himself. So seeing it again was quite a dizzy feeling.