Thank you for rescuing. Have you tried the putting a couple of blocks of pavers next to the truck ,give her a big treat when she steps on and off then keep doing that then put one on the car seat, takes a while. Do it with a leash so she feels you. Good luck. We have a pit lab mix that was thrown out of a moving car with 3 puppies, she was injured and all the puppies died. She hates the car and throws up on occasion but its less and less as we train her. She by the way is the most docile dog we have