I forget how old you said Joy is?
After having dealt with the same issue myself, please refer to thread
http://forum.oes.org/viewtopic.php?t=6906 and comments there what we do.
Vet said that some puppies get motion sick but usually outgrow it by 4-6 months. If they still get sick after that age it's an anxiety issue primarily because the dog remembers getting sick which causes the anxiety.
Start with small (like 5 minutes) trip to someplace fun like a park, etc. Try giving treats in the car why it's not moving. Whatever you can do to make the pup think that the car isn't such a bad place.
Good news is that most dogs outgrow car sickness by age 3. Things have settled down with my issues with Frank in the car, thankfully.
