Thanks to my astute readers, who apparently watched as much bad tv as I did growing up, I have unlocked the mystery of the movie that my mother thought I made up.
I was pretty sure that was it, thanks to Rob. Then Solly left this link and as soon as I saw these pictures, it all came flooding back:
[photos from lastdriveinontheleft.com]
This was a 1970's made for T.V Movie and was shown in New York as I remember, on the ABC 4:30 Movie. I remember this movie as being one of the greatest T.V Suspense/Horror films.
Yes, it was the 4:30 movie, not the 4:00 movie. I must get a copy of Crowhaven Farm.
Thanks to everyone who helped me figure this one out (ok, figured it out for me). Now I am going to spend the rest of the night thinking about those cheesy witchcraft/horror movies of my youth.