queensguy2468: It is easy, what you have to do is, walk her to the car and open the door. When she gets in the car close the door. Now walk around the back of the car and look from the back window, if she opens your lock on the door then she is the one, and if she doesn't then find someone else.
What if she wants to do that but is not sure if it is the right thing to do. You may using poor judgement