I just lost a friend tonight, what to do?

Okay this night I telling her to see something in the web. Then she said she doesnt want then I told her lazy. Then after that she said to me a lot of mean words, then I told her too about what are her negative attitudes then it goes by and by. I really got angry I said to her that shes so fugly. Shes my bestfriend and my clmate who I always hang out during recess period in school. What should I do tomorrow in school?