What should I do about my so called "friend"?

For a long time, I have been friends with a girl, lets call her "Ginger". She introduced me to her friends, lets call them " Taylor and Bonnie" Well, Taylor and and I became instant friends, but Bonnie was just kind of there. A few months later I met " Lulu" and " Debbie". Ever since, we have become a circle of friends, we always sat together. Later I found out Bonnie and I had to work together for a cl. We became friends. Taylor and I mess with each other, we call each other names, ect. But we know that we are just playing around. But Bonnie brought it to a whole new level. She got into it. She started calling me bad stuff, even though she ways a ton more then me. She secretly tells me that she's on my side, but shes trying to make it into an actual fight. I want her to stay out of it. She kicks me, punches me, ect. Im stronger, but when I try to fight back, I use my nails. When I do, she is mad at me for days and days, Im seriously starting to hate her. She and Taylor are best friends, but Im still really close with Taylor. Now my question is, how do I hang out with my other friends who sit with us, and not be freinds with her at the same time? Also, how do I tell her that I dont want to be friends with her any more?