I'm so annoyed at this girl who always thinks she is hot ****?

You can not go around dictating how people should act. Everyone does their own thing. The world would be awfully boring, if everyone was alike. Just deal with your own life, and quit worrying about what others do. It is her life, and is really not of concern to you. I hate to say it, but you are putting your nose in her business. How do you feel when people judge you? If what she is doing does not harm you in any way, you should not be concerned. Move on and enjoy your own life. You only live once!!! Take care.