I can't speak for her, but sometimes, when I'm grumpy, I get annoyed with every little thing. Like I said talk it over with her. Talk with parents or somebody you trust. Pray 'bout the situation. And if you tried everything, and she still bullies you . she isn't worth it. Ignore the mean words. I know it's hard, but they probably aren't true.
Again, Take my words with a grain of salt because I don't know anything about friendship. If they are helpful . somebody please tell me .