It's unfair, right?

So, I just wanna make sure I'm not in the wrong here...

My elder sister has 2 days to hand up an assignment. Her computer broke, the only ones left are mine and our 2nd oldest brother's. I was organising a YouTube playlist right next to her. She started saying bullshit like, "I want to do my work now" I told her that she could use the computer any other time you want, just not while I'm already using it, and that I have a zoom class in 30 minutes.

She grabbed it from me and stared doing her work. I tried to grab it back, she stared hitting me. That shit STILL hurts. I tried to take off the computer, she threatened to hit me so hard that it'll break my bones. Remind you, this is for something that isn't even her's. Right now, I just left her alone. I have enough bruises from her.

My zoom class is in 15 minutes now.

Gotta go prepare, they gave us a dress code.