My friend has been skipping class and smoking so I feel like I have to tell her to stop.
Why is she doing those things?
She doesn't know how important school is
It's great you are trying to help her out and are there for her. People need people like you in their lives.
I told her to stop smoking and that was it. She screams at me and starts attacking me that she will never stop and I'm a stupid cunt.
It sounds like she has issues going on that is making her lash out. Maybe you can find out what they are and help her through them to keep her from getting into trouble.