Twiglet, our 3 year old Jack Russell, has car/travel sickness too. We tend to make sure the car or van doesn't get too hot and she has a towel etc to make a bed (more like a nest) in her crate. Dogs like crates because it is like a den.
We also like to do small trips in the car for a few days before a long one, she tends to cope better.
Make sure to keep her hydrated and don't make to much fuss over her if she is feeling down.
Beautiful dog :) Yeah I guess Bailey is just getting used to car trips (4 months old) Australian cattle dog. In our way back home I let her rest in her 'bed' and it was a bit better.
I totally recommend a crate. Fill it with a towel and maybe some of her basket bedding, she will love it!