Stalemate...

My roommate is a weird person. She’s constantly ill and always complaining about stomach issues. She also leaves food (like chicken nuggets and other perishables) on her desk overnight and then eats them in the morning. 🤢 Because of her habit of leaving food to rot on her desk and eating it anyway coupled with the fact that her boyfriend is a sweaty mess our room constantly smells of BO and rotting food. I told her to stop leaving food out. She continues. She also doesn’t want me to use perfume or lotion or febreeze or essential oils. Basically anything I can do to make this room smell less offensive she hates. She says it gives her a headache but I think she’s full of shit because she never said anything in the first year we lived together. Also she has a history of saying shit to roommates to get them to leave. I don’t know what to say or do. Advice?