Damn, that sucks, I'm sorry that's happening to you. She sounds so pushy and thinks everything revolves around her omg.
I rarely ever speak with my siblings because I'm always in my room but when I do go outta my room, I see them and 90% of the time, we argue. I have an older sister and little sister.
My older sister was the one I always fought with, she's a year and a half older than me so the age difference/(im)maturity is the same, we would get in each other's head, bicker, yell, and get into fist fight, it was so bad to the point my mom gave up on us. But I just couldn't stand her, she always told me what to do and what not to do. And sometimes when I'm about to do it, then out of nowhere she would tell me to do it, I end up not doing it because I HATE BEING TOLD OF WHAT TO DO SO MUCH, so yeah, it was half our fault. I just wish she would mind her own business and not care about me so much because I felt like I was being watched 24/7 and it was so annoying, like, dude, calm down, you're gonna grow white hair if you keep watching over a stubborn girl like me. But the way she talked to me too was just so cold and her attitude was so terrible, I always compared the way she talked to other people to the way she talked to me and it really hurt me because, I was her sister, why would she be all rude to me and nice to everyone else? I never really cared or compared myself to anyone but with her, there was no other way to prove that she despised me. And then one time we made a plan, we were supposed to go shopping and spend the whole day together, basically sisters thing idk, I got all dressed up and she canceled on me last minute, which wasn't the first time she did it so I got fed up and pretty much just ignored her since then. My mom got really mad because we were supposed to be one family or whatever but we were fighting like all the time so I insisted I wanted to leave but my mom was also kinda getting tired of her so she made me stay and in the end, my sister left. I do feel bad, everything was my fault, if only I didn't get mad so easily but at the same time, if only she didn't do things that made me mad UGH i don't know but I feel so bad, I love her so much and I regret everything. So maybe I'm the kind of sister that one can't stand being around with. But recently I've been seeing her secretly, my mom doesn't want me seeing her so I just kinda don't tell her we hang out, and we've been hanging out a lot, and since it's summer and I only got classes in the morning, I let her come over after and we watch anime and stuff and she leaves before my mom comes home. I feel so terrible and I've begged her to come back, but she really doesn't want to. But the thing is, I think it was the way we were living. She's a great person, just not someone I can live with (why I wanted to leave because tbh I think I'm the mess here) but idk why they just won't let me.
So now, I really treasure my siblings, I don't care anymore, I love them and even if I snap on them sometimes, they're still my favorite people in the world, and I really got no one else but them.