In either the Vanished podcast or in the TV news interview, Sandra's daughter says something was telling her NOT to go over to her mom's to check on her, to protect herself. I found that surprising.
I don't remember this. I do remember the daughter saying her husband told her not to worry and not to bother going over. I think she was referring to the night before she realized her mother was missing for real. Even though it's a four mile drive, she said they were both tired and figured Sandra was in a mood.