Yeah, that's all.
I already took the discussion with her, explained myself etc., but she didn't budge. That's why I wrote here, because when I started the talk, I was sure my request was reasonable, but then I got confused. I'm... not very good at asserting myself.
She has a laptop. I offered her my room (has a TV) for the duration. I considered inviting her, but "I need to chill" didn't sound like she'd welcome the idea, and right now I'm kinda pissed.
I don't think I'm going to convince her without turning this into a fight, which I really really don't want right before my two most taxing exams. So... I'm going hunting for somewhere else to be this Saturday.
But thanks for the answers, FinnLassie and Aedilred. It's good to know that my roommate etiquette isn't completely off. Now I just need to figure out how to renegotiate the relation (in my own head) until I can move somewhere better.