To be fair, that is a thing that happens. You get used to parental pressure pushing you to do basic self-care and then when you start living on your own without that pressure you slack off and leave things undone. That's a known thing even in families where the parents aren't nearly so strict as Mrs Kitsune is.
It feels very appropriate that the two characters who debuted as background extras in the same story that got promoted to actual characters because the author liked their spiky haired designs would be friends.