Hi D.,
Without knowing a lot more, it is difficult to find a solution to this problem. I have two daughters. My oldest daughter was going through the same problem as your daughter. Whe we discussed it with our pediatrician, she suspected depression. I took my daughter to a psychologist who confirmed the diagnosis.
I was working more than 50 hours a week and completing my MBA at night. I was at home most evenings, but I was not "there" for her. I cut down my hours and now have my MBA on hold.
My daughter responded to the increased attention; we started by having a "girl's night." My daughters take turns choosing the "chick flick." We make a night of it; paint our fingernails, do each other's hair, etc... Before we can watch the movie, we take a group bubble bath in our bathing suits. We soap up our hair and make funny hairdos, etc... I have made it a habit to get out of the tub and (at the sink) shave my legs, underarms, put on lotion and pluck my eyebrows while the girls are playing. Sometimes they watch, sometimes they don't, but I know the "modeling" has made them more interested in personal hygiene.
My daughter that was depressed is so much happier and just showed an interest in shaving her legs and underarms (12 years old). I bought her an electric shaver because the manual one scared her. She did not want to cut herself. She convinced me, and I use one when I am in a hurry. The model I chose looks like a razor but is electric. It is called "Shavy Femini." It is advertised for trimming the bikini area, but it works great for shaving her legs without the fear of getting cut.
BTW, my husband is a lot happier too - in a house full of females - because he uses "girls night" as an opportunity to go do something with his guy friends. Dad is not allowed back home until 9 pm when the movie starts. :)
This is just one suggestion; however, connecting with your daughter is probably more important than her hygiene right now. I am so glad I did. I was recently diagnosed with breast cancer which put time with my daughters in a whole new perspective.
God bless,
Paula