Air Bag Light On problems of the 2001 Infiniti QX4

The contact's vehicle was involved in an accident on 8-15-05 while going 40-45 mph. The vehicle rolled over. At first , hit a mail box. Then, the back of contact's vehicle hit another car. She ended up in a ditch, rolled over, and hit a tree head-on. Upon impact neither the front or side air bags deployed. The dealer urged contact to call the manufacturer, and they said they would look into it. The contact sustained injuries. The police were called. The check engine light came on ever since she bought the vehicle. She had the sensors replaced at least six times because the light kept coming on. She said the air bag light never came on.