How can I help my girlfriend ?

Me and my girlfriend went to a concert with her youth group tonight towards the end of the concert she got a headache now she has a really bad one. We're still half a hour from home when we get back to town we'll still have a few people to drop off before us. We're close to the last ones off. She keeps moaning a lot. In a way she feels like she's gonna be sick. How can I help her ?