Malfoy had given her his wand. Or had she accidentally taken it from him? Hermione didn’t know and she wasn’t in the right state of mind to contemplate it either. The effects of the cruciatus curse lingered longer than they should have. According to Bill, it was due to her still not quite healed heart and the aftereffects of the incident at the DoM. It left her weak and unable to stay conscious for more than a few hours.