How do I heal from this

I always have memories of my aunt in law and how she treated me when I was younger, I was a very picky child and she would always say oh she doesn’t want to eat because she doesn’t want to get fat, or when ever I cried bc of how someone else was treating me she’d say oh those are crocodile tears, she always treated me different than other kids, I remember one day we went out to eat I went to play and she drank my soda with out even asking.... I felt like she was always jealous of me maybe because I had more things growing up than my cousins had. Idk why but she made me feel worthless when I was younger.there was one day when I was about 13 years old that I started talking to thee three girls and she assumed I was talking crap about her daughter Bc she got pregnant at that age . I kept on saying I wasn’t talking crap and she was so angry at me and put my cousin against me .... I never understood why ... she’s never apologized to me and every time I’m around her I get soo much anxiety , ptsd symptoms , I can’t be around her , I freeze can’t think etc. When she’s around me today she’s always saying you should teach me how to do makeup , or we should go out and you should help me pick out what I should buy. She sent me a friend request on fb to and I never accepted it. I don’t want anything to do with her. I really want to heal from this but I don’t know how to.