@ S. EARL MARTIN - your story reminds me of something I did as a teenager. About 10 of us were in a really old detached & derelict house, it was eerie.. I stopped suddenly and said
'No, No get out now'
Well they couldn't get out quick enough, stumbling and falling over the debris on the floor. They shit themselves for want of a better pharse.. Outside I laughed and they couldn't believe they fell for it. But had I not laughed to this day they would probably believe I saw a ghost or had some wiered paranormal experience. It was a practical joke I played, and they played straight into my hands. A bit of fun. Try it yourself sometime!
There are afew things I notice with your story. This girl says she saw a man approaching the car and he was skinny and he was dead... How did she know he was dead? Did she feel his heartbeat? Even if she did see a man there is no way of her knowing he was dead. Do you see what I mean?
You say your grandfather was 6.1 this is tall, if she saw a tall man, she would have said 'tall and skinny'. But she didn't. Most old men are skinny. I know few fat old men, this because they're not usually in very good health if they are so aged. So if she's said 'fat old man' well, no one would would they?
From her other story about the 'tail' it sounds like this girl likes to literally tell 'tails' she sounds like one of those people I remember from childhood who had fantastical imaginations and had all sorts of bizarre stories to tell, obviously made up.
Only on enquiring further did she say to you she knew it was trying to tell you something, if this was the case why didnt' she tell you this at the time? And the reflection was just that, but you have become so swept up in the story you question your own thoughts to validate the story.
Do you understand?
A quick example of this: I was at a psychic reading and a friend Elen came out after seeing the fortune teller and said 'Wow amazing, she said Jack lacks confidence' and I asked 'She actually said Jacks name?' and she said 'No but I knew she was talking about him'..

?
The only person who said Jack lacks confidence is Elen herself.. Do you understand that. That is kind of what has happened with your story above. It's common. You have to be a linguist to identify it but easy to spot when you know how to. There is a name for it, it's SUBJECTIVE VALIDATION here's more info
http://www.skepdic.com/subjectivevalidation.html