Dropping friends

How do I drop a friendship? This girl and I have gotten to become pretty good friends, I was never really friends with her because she was part of that not so nice group at my school. But she was cool for a while but now I relise she's sort of a bitch and really annoying. I also can't just leave her because I know she'll tell my friends to not be friends with me and she'll get mad. She's also good friends with all of my friends, so they might get mad at me too. I need help😫   💞💞