I understand your dilemma. I have a 12 year old son, as well as three younger daughters. We live in a somewhat rural area, and I AM NOT comfortable leaving him alone. He is a good kid, but with hours and hours each day "on your own" you can get in trouble. I've seen it with other kids. Crank phone calls, getting into the liquor cabinet, inappropriate internet/TV programs, trying out smoking, etc....My son is a good kid, but friends and what they do all day is an influence you have to reckon with. I only work part-time, and when I work, he will be at my mother-in-laws, along with the others...Good Grammy time. He can still read, etc, but is supervised. Kids alone all day can get into trouble. I would let your daughters stay with a relative or friend who is in the same boat. Maybe mothers of your daughter's friends have similar concerns. Find out what they are doing. Lastly, I wouldn't be as concerned about after school supervision, since it is only for a short time. Have a chore list, and require homework be done by the time you get home, and there won't be enough time for her to get in trouble.