I'd suggest getting her to love the car first without having to travel in it. You need to give her an incentive to try it.
Take her to the car when she is hungry and have treats first by the car, then in the rear footwell and on the rear seats. or if you want her to travel in the back I suggest a dog ramp up to it with a trail of treats up it into the back.
Have a special phase you say to her while she is getting the treats. Like let's go to the car - said in an excited voice.
She does not have to stay in the car, and it does not matter if she gets in first time as long it is a positive experience for her, just let her get out as soon as she has finished the treats, praise her and take her home.
Do that for two or three days, each time using the phrase. Once she is clearly looking forward to it try adding her usual bed in the back and a treat which takes a bit longer to eat, like a filled kong.
The next step is to put the tailgate down and sit on a seat with your back to her as you would if you were driving, but talk to her. As soon as the treat is finished let her out and go home.
Gradually work up to (a) running the engine (b) a drive round the block and then onto longer drives, no more than ten minutes to start with. Always give her a treat and always use the phrase.
You could also try including another dog who does love the car so she can see there is nothing to worry about.