My friend doesn't like my heritage?

I have a difficult friendship with someone I know. In school, she was the one who would push me down stairs and then laugh. She was also a little self-centered and would brag about how thin she was. I would always laugh it off but secretly was very very hurt for the longest time. Her comments would always get to me and make me feel horrible. She would also point out my flaws and my pimples. She would point and say "You have one there, and there, and there..." It hurt very badly but I never spoke or else she would get very mad at me and for accusing her of something she "didn't do" and she would then become very angry with me. I learned to bite my tongue but now I think is the time to stand up to her when she insults my heritage. On facebook, she wrote her status in Italian (she used google translate) And she isn't Italian. A friend of mine (Who is Italian) commented "You wish you were Italian" then she commented "I would never want to be Italian in my life". It hurt my feelings but I bit my tongue yet again. But I think this is the time to tell her how I feel. I need opinions though on what I should do first. How I should say it? Where? When? Thank you for reading this!!!!!!!!!!!