This is a small issue and I don't know how to handle it because talking has gotten nowhere.
I 24F live with two roommates, Lisa 24F, and Xavier 23M. We've known each other since highschool, we are extremely close, and moving in together hasn't been a problem really! We all get along, but there is just this one thing.
We each have a cat, 3 females, they are great cats. However Lisa doesn't clean her cats litter box like she should. She will wait damn near a week before touching it, and sometimes me or Xavier have to do it. BOTH OF US have talked to her about this SEVERAL TIMES, and how it's not great for the cat, and she knows this, and she feels bad, she has depression and it can make her slack, and I wouldn't care if it didn't affect the cat.
Besides this Lisa is a good roommate, pays bills, cooks for the house, and takes the cats to vets regularly. It's just this one thing. What can I say or do to make her get better at this or stay on top of it more?
Tldr: Roommate fails to clean her cats litter box in a timely manner and talking hasn't helped.