Is she used to the crate at home? If not then I would start there. If she is already used to the crate or if you decide not to crate her in the car here are some suggestions to help her get used to the car:
(As with any training process only proceed to the next step when the current step is completed and if she starts to behave badly back up a step and start again. Also once she has overcome a step continue that step for about 2 more times just to make sure). Try to do this often, if possible 2-3 times a day for 5-10 minutes each. Each step may take anywhere from a day to a week or 2 so be patient.

Introduce her to the car slowly, start by just sitting in the car and praise with food, voice, petting &/or toys ONLY when she is quiet and calm. Ignore the bad behavior and praise with good.

Then start the car and do the same while the car is running.

Then only drive to the end of the driveway and sit there for a few minutes.

Then drive to the end of the street. (if in the country only go about 1/4 mile.

Eventually lenghthen the distance start with the end of the street, then around the block, then around 2 blocks etc...

Just make sure only positive things happen in the car never punish. Also by taking her to fun places will help. If she likes the park take her there or if she enjoys playing with a friends dog take her there, take her through the McD's drivethrough and share your hamburg with her etc..