Finally!!!
I saw the trailer for this film back in 1980, I was eight years-old. The only image that stayed in my mind was a scene in which a girl had a piece of glass on her face and it glimmered in the light (I thought her eyes were lit up. I didn't remember the name of the picture and it has haunted me for years.
I tried and tried and tried and tried to figure out what that movie was and just the other night, I was watching an old Siskel and Ebert special about women in danger in the movies and they featured that trailer. I said "That's it!" Now I just have to figure out where I can see it. Netflix doesn't have it, YouTube doesn't have it. What do I do without buying it?
http://www.armchairoscars.com/