Roommate has too many cats

We’ve lived together for 3 years. Initially she just had one cat. I adopted one, then she adopted 2 more. Our apartment is now feeling very crowded. Her newest cat is only 3 months old and is not litter box trained. He’s been pooping all over apartment. He’s pooped several times in my bathroom now, even though I scoop my litter box daily. After I complained to my roommate, she admitted that he had been pooping in her bathroom and closet for a while now. She only has one litter box for her 3 cats to share and doesn’t scoop it. She just dumps the whole thing in a trash bag every few weeks. I frequently can smell the litter box all the way in the kitchen.

Our apartment smells disgusting, the new cat is constantly screaming at me for food, I’m just so fed up. We failed our apartment inspection because of the smell from her litter box and her rotting food she leaves in the fridge. I really don’t know what to do anymore, she’s not receptive to any sort of criticism. We have another inspection tomorrow so I think I’m gonna have to deep clean her room while she’s at work. I’m just so tired of living with the smell and all the cats constantly under foot.