Dsis has invited me to stay in half term with my two dc. I like to see her, though we're not particularly close. She lives on her own and is not particularly sociable so I think she enjoys visits (hence inviting us) but spends most of her spare time quite solitarily when we're not there (she does have a few other friends though).
The main issue, which is difficult to raise with her, is hygiene. She lives in a 3 bed house and it isn't clean. There is cat food over the floor (she does clean it but leaves a sticky residue). The rooms we sleep in are covered with cat hair and dirt. I've tried joking about it 'oh I think tigger has snuck in and slept in my bed, there's fur and twigs on the pillow' but she hushes me. I have had pets in the past so like animals, but I don't want to sleep in a cat bed. In the downstairs hallway there's cat litter over the floor 
when I mention it she brushes off my comment. Again she sweeps it but not very often and there's still cat ablution residue.
I would happily pay for a b&b but that would be really awkward, she has the spare room. I would happily clean for her but she can't see the problem and would be offended.
Aibu only to see her on day trips now?