One night while she was out drinking she never returned home.
Why didn't she return home?
I have no idea, I was thinking that she just ran off on me.
If someone is expected back but fails to return then its important to get the proper authorities involved. They could be hurt or worse and cant make their way home without the proper help.
You are right. If a person can't find her way back home we should do something about it.
You should probably call the cops. Don't believe that TV rumor about a minimum time, report missing people at once.