You may be right about someone else driving the vehicles home. The mother's car being parked in the carport could mean that someone was following her car in traffic. She hurried and parked in the carport giving her quicker entry to the house. She may have called her daughter at one of those parties to tell her what happened. Apparently, if this happened, she didn't fear that person enough to call the police. Also, did the mother own any kind of weapon that may have been taken from the house that night. Sometimes people who have a weapon can't get to it quickly enough to defend themselves. Of course this is all theory. I hope someone can think of something to solve this case soon. The culprit, or culprits, could be dead by now.I don't know who killed them but Sherrill stands out as far as being older and not at any parties. It would be easier to get a parent to leave their home if they thought their child was in trouble. If she woke up and found cars being dropped off by people other than Suzie and Stacy that could have been an issue. If something happened to one or both girls she might have gone out to help them. She could have gotten into a car with someone she believed was taking her to the hospital or jail. The girls could have gone somewhere else from Suzie's and something could have happened then. I wonder if the timeline police were given is correct.