There is some solid advice here. My suggestion is that you see about getting some meds to calm her down for a little while, then after a while she may not need them anymore. That would be the easy way of doing it.
Either way, she is either getting sick from the motion or sick because of nerves.
If it is motion, meds may be the best and only resolution.. though she could eventually grow out of it.
If it is nerves, you need to find a way to disconnect the reaction from the trigger. The best way to do this is to give her another response to the car. Gradually reward her getting in the car with treats, petting, and maybe taking her to fun places. This will make her relate the car ride to good things. If you can, avoid long rides for now, and when you take her to the car, be patient. Don't force her, don't let her run away, don't make it emotional. She looks to you for leadership, show her that it is okay, no big deal... good things come from it.
Either way, she is either getting sick from the motion or sick because of nerves.
If it is motion, meds may be the best and only resolution.. though she could eventually grow out of it.
If it is nerves, you need to find a way to disconnect the reaction from the trigger. The best way to do this is to give her another response to the car. Gradually reward her getting in the car with treats, petting, and maybe taking her to fun places. This will make her relate the car ride to good things. If you can, avoid long rides for now, and when you take her to the car, be patient. Don't force her, don't let her run away, don't make it emotional. She looks to you for leadership, show her that it is okay, no big deal... good things come from it.