It is sad to see older women let themselves go. My mom is not even that old (just turned 50) but I had to tell her plain and simple "please dress better and take care of yourself", she does shower twice a day, so hygiene is not a problem, but comestic things like waxing eyebrows, fixing hair, putting a bra on!! She is a young and attractive woman and I just feel bad that she doesn't want to put some effort on herself. She is getting better, and is now always well put together when I am around (mostly because she doesn't want to take crap from me) she also asks me to take her to wax her eyebrows and get manicures.
My MIL is super obese and looks like a homeless person, always stinking and dirty... Her husband constantly tells her how bad she looks, but I think she is depress and just gave up. Unfortunally, she doesn't have daughters, but her mom is a very well put together lady and always looking good, so when she is around she helps her to get somewhat better... But once she is gone, she goes back to her homeless-looking self.
Maybe sometimes I come across as a big b, but it works and I know she feels better when she looks good