The data recorder records everything;Speed, direction and stress points (used by airbag system), VDC, steering wheel position, Brake position etc in the car for some time previous to the accident. This is done to provided evidence in a trial where a serious accident has occurred, or where mechanical failure is suspected;
For example; if the air back does not go off, and you were traveling 50mph and it should have gone off this caused death, you family could sue the manufacture for a failure of the system; And hence this data could be used as evidence in a trial. With that logic, it would not make sense that the data is only recorded "if" air bags are involved;
The sensors literally record everything from gas pedal position, acceleration, the data from stability control system etc; This data is constantly recorded for a specific period of time (ie, the last 10 min or something like that, I dont recall the exact amount of time)
Further, some systems even record the weight of the people sitting in the seats (to prove who may have been driving). Getting access to this data is very hard as its designed to be used in only the most seriose of car accidents for the purpose of understanding what has happened to prevent it from happening again and where criminal charges etc may be involved.
Each manafacture has a team of people that read the DMV and police reports looking for odd events, and send out a special team to investiage. For example, a accident that 5mph that causes death could make the investigation list; The system is very intergrated, and hard to get to the for something as simple as what was claimed in this thread.
I have seen some of these reports from a GM car, and the data is massive. They generally use a bit of software that reads the data, but then dumps it into a simulator so they can see exactly what happened.
I would suggest that if you cant trust your daughter when she tells you how it happened, you have bigger problems. Also try the following websites for future tracking purpose:
http://www.sfgate.com/cgi-bin/...R.TMPh ... /s...25196
There are hundreds more of these sites, if you dont find what you are looking for on the above 3 links