How can I get Vicki 4 characters to fit into the police car?

skinnercurtis_175182bd68

I have the police car that I bought from the Daz store, and am wanting to have Vicki 4 sitting in the driver's seat as if she is driving the car. I tried a few minutes ago with a great pose, but the interior of the car was too small for her. Any ideas how I can get the car and its interior to be the right size for her? If I increase the scale size, how much would I have to increase it so that it doesn't look weird?