Blocked window

My roommate has blocked the only window in the house with her TV and threatened me not to touch it. She leaves her dirty dishes in the sink for days and when I try to reason with her, she says “admit that you’re psychotic.” She never cleans the house and says “show me on the lease where it says it’s my responsibility to clean. I’m not going to clean, deal with it.”

I’m so fed up. It’s causing me so much mental stress. What can I do about this situation?