What should I do?

Delilah

So there's this girl. Lets call her Glenda. Nobody likes Glenda, but to me she's really sweet. Annoying, but still sweet. She recently started sitting at a lunch table with me and the rest of my friends, because the rest of her "friends" bully her. This group of girls, Glendas "friends" come and sit on the opposite side of the table of me and Glenda. They start whispering to each other, trying to intimidate us. Looking disgusted my other friends things, as she was in the bathroom. They were trying to make small talk or whatever. But they had the fakest looks on their faces. They're these ugly, fake girls that think they're better than everyone. Im a pretty chill girl, most people give me a nod or a smile, and that's it. I think Im pretty easy to get along with, and in all of my years of school, this hasn't happened. BUT I DON'T TAKE SHIT. Even the THOUGHT of highschool changes people. Im not trying to get in any sort of conflict 😅, but I do want to stand up for Glenda. Part of me would LOVE to slap the smug looks off their faces in the name of "justice" though 😂 Any advice would be great!