Are you kidding me?! The 12 y/o girl shouldn't be considered a nuisance when she's peering in windows and basicly stalking this woman and her Grandchildren?! Yes, the child has a mental illness and yes, Grandma should explain to her Grand kids what that means so the do understand. However, we don't know if the Grandkids are much younger then the 12 y/o and, quite frankly, why should anyone have to babysit someone else's child because they are being neglected at home. I wouldn't want to be put into this situation either. Perhaps she should call child services if she feels the 12 y/o is neglected, if the stalking continues, she should get a restraining order,or at the very least, speak to the police and see what can be done. If the 12 y/o trips and hurts herself on Grandma's property, I'm sure her oblivious mother would "wake up and smell the lawsuit".-Not a babysitter-NJ

I also disagree with Ann on this one. I am so sick of hearing the advice that we should use these opportunities to broaden our outlooks or become a positive influence for the child. There is a time and a place for everything and peeping in windows and not following instructions to go home are NOT the right time and place. Perhaps the family is right at meal time or doing some activity where the child could be hurt. The OP should walk the girl back home and tell the parents that the child has wandered over. Repeat as needed until they get the message.