Help me cuz I'm cute! jk jk?

Hey it's not Mandy by the way. I'm her sister Cailey! Anyways my bff are being NSA at school. Basically their being stuck up and imature bi.tches! My friend Lena only hangs out with me and my other friend when her other friends aren't around, then when they make up with her, she completely ditches me and Patricia (my other friend). and the worst part is Lena's other friends start stalking us at recess and being really rude. I'm really mad at Lena but she always acts like I did something wrong. I just refused to hang out with her other friends cuz they were really rude to Patricia and called her a skanky w.hore. So basically, I need help on how to end the fighting in the cliest way, ways to get back at her, or your opinion on the whole thing. Just don't call me too young to be sayin this stuff. I'm fourteen year old ninth grader, but I don't leave my middle school till grade ten. I live in a small town if it helps.