I believe there was a report made early on that they didn't have a phone in the home because the school has some kind of calling system that contacts you for school closings. I've never had that system anywhere I have lived but besides tv and radio there are websites for the school closings also that I check now. I don't know if that story is still available but I read it here way back when this case first was reported on.
I think about this little girl everyday, she was one of several that disappeared closely together along with Tekretia Buggs, Amber Harris and the little girl (name?) she was 10 disappeared going to school and found later in a rock quarry, had been killed by that animal that killed his wife and 3 beautiful daughters. It was also reported that the dogs they used tracked Adreanna's scent to the lake from her house in another direction from heading towards the school. I don't see how her stepfather could've seen her walk that way unless you don't believe the dogs.