general problems of the 2000 Ford Taurus

Friday afternoon I took my 90 year old mother and drove to chick filet to buy a takeout lunch. I drove home to my mother's house and was in the process of backing up the car into her driveway. I stopped the car and looked behind me to check for anyone walking and then heard my mom scream fire!, fire!. As I quickly turned my head back I saw flames jumping out from under the hood of my 2000 Ford Taurus station wagon. I quickly turn off the car, grabbing the keys as I went, yelled at my mom to get out and then jumped out of the car and raced back to open the trunk so that I could get my mother's walker. As I arrived at my mother's car door I helped her out and pulled off her oxygen canula and told her to walk as fast as she could towards the house. I then grabbed the oxygen tank, purses, and lunch and ran toward the house screaming for someone to call the fire department. A neighbor said they would. I unlocked my mother's door and she pressed her life alert button and called the fire department. I walked out side to wait for the fire department and saw a man near the car looking at it. I yelled at him to get away in case it blew up. He did and in about 30 seconds it blew glass, and other bits all about and was fully engulfed with fire. The fire department took about 7 minutes to get there and the car was completely engulfed and burning up from front to back. We were told that it was a total loss. The scary thing is that there was no warning what so ever to let us know that this was about to happen. No smoke, no smells, nothing. My mother and I could have been burned up if we had not been able to get out in time. My car was well maintained and I had just purchased four new tires for it. We drove our car very carefully and we had owned it for 13 years and had low mileage only 46,000 miles on it. Why did this car catch fire and explode without warning.