To answer your question, I view it as she assumed the inherent risk by attending the tournament. She was apparently 300 yards down-range from the tee shot. The golfers in the group state that they yelled "fore" as soon as they realized the shot was errant.
I don't see her as having much of a case.
Getting hit in the eye by a 300 yard tee shot on a hole you are watching really is on the fan. If it was a shanked ball right off the tee or if they got hit by a ball coming from another hole, that would maybe be different.
I personally think it is wrong to sue your parents for giving you genetically inferior eyeballs!**If my eyeball exploded from a golfball, I'd probably try to sue also.
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