<human>: Can you succinctly summarize the text in 1-3 sentences?

My roommate, who I have signed a lease with for next year living in the same bedroom, smells awful.

Earlier in the semester she started dating somebody, and would shower every time before going over to their place.  
Now she's become comfortable with her S/O enough so that she hasn't showered in a very long time, leaves piles of dirty clothes around the dorm room, and leaves food out to spoil.

She's very sensitive about the subject, and when I've hinted at the smell of the room in the past, she's retaliated immediately with that my shoes in my closet smell bad (I've put an air freshener in there since she mentioned it, and the smell went away), and was be passive aggressive for the rest of the day. 

She's always been a smoker, but she's started smoking more frequently now, and the smell sticks to her clothes and fills the room with a stale smoke smell that I hate. 

She can be rather volatile and passive aggressive, which makes me nervous about confronting her.  I mentioned the smoke smell tonight, and she got defensive, ignored me (being outwardly irritated that I was talking to her while she was doing an assignment), and later went to bed. 

Suggestions for how can I get her to take care of the smell (mostly the stale cigarette smell) without things blowing up?
<bot>: My roommate smells really bad, stopped showering, and leaves stale cigarette smell in room.  She's sensitive about the topic, and gets angry/passive aggressive if I bring it up.