You can manage motion sickness by taking medicines like cinnarizine or dimenhydrinate before travel, sitting in a stable position (front seat), and keeping your eyes on the horizon. Stay hydrated, avoid heavy meals, and use fresh air or AC airflow to reduce nausea.

If vomiting continues despite these medicines, it may be severe pregnancy vomiting (hyperemesis gravidarum). She needs urgent evaluation, possible IV fluids, and safer anti-nausea options. Please visit a gynecologist or hospital immediately to prevent dehydration.