Through what mechanism could someone make ginormous crystals like that? Why would they "cry" them out when they were smaller instead of waiting for them to get so big? Even having the smallest object in your eye is uncomfortable as hell. Having something like that in would be unbearable.
Same mechanism that makes kidney stones? Calcification? Various chemical or genetic issues that culminate into this occurring? I've seen stranger things happen to people, like tree man. The only thing about the video that was odd to me is how she didn't seem that put off by the experience.
A quick Google search and you will find that it is a hoax.