Either M.'s super controlling/ untrusting... from a culture where it's considered a sign of respect for someone else to "take care of them" (aka kids who are loved are cleansed either by servants or parents)...or her daughter is reaping the rewards from not listening / cleaning herself. Many kids end up under parental supervision after time without because they neglect their hygiene.
The culture thing occasionally crops up when least expected. I have friends from a certain part of africa who are horrified that children do their own hair / bathe themselves. "Does nobody LOVE the poor child?" Another set of friends came from a very wealthy background, but no longer are, so the mum bathes, oils, does the hair of her children since they cannot afford the stylists she grew up with and she doesn't want her children shorted just because they can't afford professionals like she had.