No one suggested that a car must reach 60 MPH in order for it to be a deadly weapon. Apparently libertines love to put up strawmen. I am not sure why.
And you apparently can't answer any questions. Occam's Razor, all things being equal what is more plausible, that her car, given the very short amount of space, reached a very low rate of speed, or was able to come to a "life-threatening" speed??? And just what speed did she need to attain in order to become a "deadly weapon"????? Air bags don't deploy until about a 30 MPH impact.
Wouldn’t there be significant damage to the cars if you were correct? Wouldn’t the damage at least be visible?