My mom wants to live with me on the college campus, how should I tell her that I dont want her to?

I am an international student and going to a university in states. I just turned 19. I have been living in the dorm in states for 3 years. My mom is a kind of person who wants to know every single thing that happen in my life. I feel like I have no privacy while living with her. She has been asking me if she could come to stay with me in the university. I told her too many times that I do not want her to live with me. But she still keep asking. What should I do or say so that she will stop wanting to live with me? I think I'm old enough to be myself and do my own thing. I just dont want to say mean stuff to hurt her feelings......thank you

Tell your dad to tell your mom that you will not be able to study as you should if your mom lives with you and also tell your mom that it is not accepted by your school to have parents live with students.