You can drill rules over and over again, but there is no guarantee they will remember when it comes time to make a choice. There was a segment on the Today show a couple of weeks ago where the child of Natalie (one of the hosts of the show) was secretly filmed with some friends when an ice cream truck pulled up and the guy driving it talked the boys into getting into his truck. Natalie was visibly shaken when her son did this b/c she has drilled it into him so much. There are usually laws prohibiting a child so young as six being alone. At least in my state. I think the youngest (legally) allowable is 11, but not sure any more.
As for the OP, I agree with lovesdragonflies. I know you would feel horrible if something happened to that little girl. Whether it's your problem or your business, you have to do what feels right to you. Good luck!
You expressed this so well. A six yr old can be told the rules and you can even have him/her practice them, but they just don't have enough experience to have correct judgment in all these different situations.
BTW, I'm pretty sure you'd be arrested for child neglect if the authorities found a six yr old home alone in Virginia. Helene, maybe your state is different. However, I never left our older dd home alone until she was 10, and even then it was for 20 minutes, gradually increasing until she got to be 11-12.
. But regardless of the law, I would never leave a 6 year old home alone, no way no how.
She was so sad. She thought I forgot about her....