Side/window Air Bag problems of the 2005 Saturn VUE

My daughter was driving through the target parking lot in humble texas when side airbags deployed without an apparent reason. In previoys minor accidents no airbags deployed. Car now has issues with damaged headliner and other expensive parts without a collision therefore I appear to be out the vost to repair and to be frank and relatively certain tat vehicle may be worthless due to the deployment of the safety gear.

Front end of 2007 Saturn Vue awd hit rear end of 2005 Dodge 1500 on his tow hitch. Impact speed estimated at 20mph. Whole front end was crushed inward in a v-shape because of the tow hitch. The front driver side airbag did not activate, allowing the driver to hit the steering wheel on their forehead. Taken to er by ambulance for check up. Car towed away. Why didn't the airbag go off? police officer said that some airbags do go off, and some don't go off. Seems like the airbag should have been activated unless there was a defect or some other extenuating circumstances (which I don't see). Damage amount estimated by insurer at $6666. 44.