How to push someone out of my life?

Say ENOUGH IS ENOUGH, and you have had to the top with her really explain how you feel and how frustrated you are. She needs to see that you really mean what you say otherwise she will carry on otherwise try and avoid her i know its hard but try and not make eye contact and if you see her approaching just try and move away always stick with someone like a best or close friend because she is most likely to come up to you when you are alone.