In day schools that I’ve been familiar with, the students learned daily life skills such as how to call 911 or tap in a phone number on a landline. It is possible this rural location doesn't have great cell service. Many areas like that still use landlines. Perhaps she chose the Phone a Friend option this particular day. It is also possible the neighbors were familiar enough with her and randomly stopped to pick her up. Of course we hope all the people around her house have her best interest at heart. Maybe not tho. Crime of opportunity? Sure hope she sends us a sign so her family can have her home ASAP.