ajzend wrote: "she doesn't lock the door to the house when she is home."
I was headed off somewhere one morning and my neighbor's front door was wide open with no car in the driveway. I stopped and knocked on the door but no answer. I went over to her dad's who lives 1/4 mile away and asked him if he had heard from her, but didn't tell him what I had seen (he was 90 then and didn't want to upset him).
Thinking the worst, I was going back home to call the cops when I spot a sheriff's car in the neighborhood. I stopped and asked her to follow me home. When we got there I let her (deputy) go to the door first (I was imagining my neighbor laying on the floor dead). She knocked, and my neighbor came to the door surprised to see an officer.
Turns out, she was on the phone when I knocked and didn't hear me, plus her car was at the shop getting fixed. What a relief!!! Good thing is she was safe...and I got a nice hug from her for my efforts 
She STILL keeps her front door open when she's home. I have always locked my house and car doors, did manage to lock myself out of the house once but found a window I could jimmy open (fixed that too) to get inside.
