She goes on short car rides several times a week (to and from daycare) and is fine. It is the 30 minute or longer rides that are the problem. She doesn't get sick every time so that gives me hope that she will outgrow it.
She was quite nervous about car rides when we first got her. Now she is getting in and out of the car/truck by herself. I'm thankful we have an older dog who has shown her the ropes and is a calm traveler.
Thank you for all your suggestions. You give me hope that she will outgrow it.