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l saw that episode too .
here is a
Link about the girl who cries glass .
Good link Fawkes!
I, too, have seen something about this girl on TV, I distinctly remember the word "crystals" being used.
Regarding her denying it all later on, could it not be because she would have been innundated with letters, telephone calls and people camping on her doorstep. Perhaps debunking her own claim was easier than standing by what she claimed in the past was, in fact, truth.
I do not believe she could put glass or sharp pieces of crystal into her eyes without eventual damage (plus it would have bloody hurt. The smallest grain of dust in the eye feels like a boulder, imagine what a piece of glass would feel like).
I have a strong suspicion that this was genuine, the only trouble was, people would probably have not left her alone.