Sweetie222
I know that it is law that people in the back seat need to wear a belt, which didn't concern this person at all. I think the bigger issue is that I asked her and she dismissed my concerns.
That's the bit that bothered me about your post. After pointing out the danger she posed, she was completely indifferent - "it won't happen, but if it did, it did" - to the possibility that she could've caused serious injury to you or the driver... or even worse.
She's entitled to take a fatalistic attitude about her own life, but not yours - nor anyone else's.
I'd be dropping her as a friend immediately, not because I'm a goody-goody about obeying the Law but because she sounds like a completely self-absorbed individual - and completely lacking in common sense. You just don't say things like that to other people. Jeez.