That’s how I see it, because she’s always been an immature womanchild. (Although that is an insult to actual children, because many of them regard the family pet as family or feed and walk them to learn responsibility from an early age.) Sarah is not cleaning that box often enough and doesn’t feel like she “deserves” to take care of the cat now that her mom is too incapacitated to do basic care for herself, let alone the cat.
Thirteen years of companionship means nothing to Pixy because she doesn’t want to clean for five minutes. She deserved all the reaming she received for that post.
You’d think Pixy would be all about shikibuton futon life after watching all that anime she clearly rotted with her brain with. Then again, she got all the wrong ideas about youth, skincare, and personal hygiene from watching those same characters bathing.
I wouldn’t say she deserves sleeping on newspaper just yet, but she’s getting close to that being a non-zero possible outcome at the rate she’s going. Most of the mentally ill homeless bums doing just that didn’t end up that way overnight.