Front Seat Head Restraint problems of the 2015 Chevrolet Spark

I was a front-seat passenger in this vehicle. The vehicle was rear-ended. The driver of our vehicle had braked but was still moving at approx 25-30 mph; the car that hit us was likely going 55-60 mph. This accident happened at approx. 4:25 pm on April 29, 2016 along northbound I-5, just past lacey, wa. The sky and air were clear and the highway surface was dry. The wa state troopers responded and cited the driver of the other vehicle; our vehicle did not hit anything, and our driver was not cited. I am not aware of the extent of damage to the vehicle that hit us or to its occupants; a police report is available. Both front seats in this 2015 chev Spark failed or broke upon impact. The driver seat back broke, and came up and slapped the driver hard in the back. She said the wind was knocked out of her and she could not breathe. She has a bruise on the back of her head where the headrest hit her, and she has a concussion. She did not impact the steering wheel. No airbags deployed. She maintained an upright position and maintained control of the vehicle even though her seat had failed. My seat (front passenger seat) broke and slammed forward on the runners. I was slammed into the dashboard, bruising my chest and my lower front legs, and also have deep bruising from seat belt impact. The metal runners on the seat slammed into the back of my legs, leaving very large and painful hematoma on the backs of both my lower legs. The seat back dropped and I fell backward.