How would you behave with a groupmate who drove the car into a ditch?

I went home in the car of a groupmate from school yesterday evening. We were talking about the morning's syntax testpaper, which was very difficult and I think, she became nervous and maybe that's why she didn't perceive a curve, she couldn't break and we got to a ditch. Luckily her car was pulled out in a short time, but while we were coming home she was rude with me, in vain I tried to be positive. She told me that the car repair will cost a lot and I have no any damage. Only my right arm has been paining because I put my hand to the windscreen, because I didn't fasten the safety belt. I don't know how to behave with this girl in the future. I couldn't calm her down at all. Instead, she became very nervous, and she was very rude with me. So, what should I do now? I feel very uncomfortably. She was one of my favourite groupmates. (my damage is that my arm has been paining and I arrived home in the night because of her, and I'm happy that I am not dead, and it was a big shock for me)