I think she probably is in fact carsick, or at least is nervous she will get carsick. As someone who has had bad carsickness her whole life, here are a few suggestions:
- Make sure the car is not hot, point as much cold air on her as possible. If possible cool off the car a bit before she gets in.
- Make sure she has a light salty snack for the car, even for short rides. Being at all hungry immediately makes me carsick. Mini pretzels or goldfish are perfect, we always have a tupperware full of them that we grab on the way out the door.
-Don't allow toys in the car, that's probably contributing to the sickness if she's looking at them. This is where snacks help too, it's an activity.
-Keep kids dramamine in the car