The contact called on behalf of his daughter who owns a 2015 Mazda CX5. The contact stated that while his daughter was loading groceries in the trunk, the liftgate dropped unexpectedly and the corner of the liftgate hit her in the head, causing a laceration. The contact's daughter was taken to urgent care where she was informed that she had sustained a laceration and three staples were put on the laceration. The dealer was notified of the failure and an appointment was scheduled. The vehicle was not diagnosed or repaired. The contact stated that the vehicle was previously repaired under NHTSA Campaign Number: 16V644000 (Structure); however, the recall remedy failed to resolve the safety issue. The manufacturer was notified of the failure and informed the contact that the recall repair was one-time free of charge and they were not obligated to repair additional failures. The failure mileage was approximately 103,000.