From my own middle/high school experiences, I've noticed bullying between girls is more subtle and not so (overtly) physical. Female bullies pretend they're your friend and deflect any accusations that they dislike you or are trying to hurt you, playing it off as a joke or trying to turn the blame on you (ex: "You're too sensitive! Don't take it so seriously!"). Verbal abuse is backhanded compliments or "teasing" insults meant to hurt you and poke at your insecurities, while physical abuse is limited to stuff like hair-pulling or "accidentally" stepping on your hands and feet, or jostling you. Lots of gaslighting.
As a kid, the girl who hated me with a passion pushed me into a creek (accidentally, of course :')), took every opportunity to step on me or shove me, made fun of my name, clothes, and appearance, messed with my food, lied about me to our peers (making up stories about bad things I did/said- though no one really believed her), and tried to manipulate/trick me into doing things that would get me into trouble with our parents and teachers. All the while claiming to be my friend.
She was less the snarky, giggling movie bully who enjoys tormenting the shy girl, and more a genuinely angry person who struggled with self-loathing and envy, targeting me because she couldn't stand that I seemed to have everything she wanted and couldn't have. To this day, she still dislikes me, but I'm glad to say we've reconciled.