First, I would toss out everything that this Carmen Brown person is saying.
None of that is accurate.
1. The restraints don't click. They are hydraulic, and go down silently. In addition there are redundant (secondary hydraulic) systems in place to insure that the restraints don't release while the ride is in motion. Not to mention that the RCS won't allow the train to be dispatched if it senses that any of the restraints are not fully locked. Actual restraint failure is extremely uncommon, almost to the point of impossible.
2. She is incorrect about where the accident happened. It wasn't on the drop, it was at the overbanked turn after the double-down maneuver following the first drop.
If I had to guess, and I don't mean to be offensive to anyone here, I would immediately assume that she was of a body type that makes it difficult to seat properly. Similar to the accident a few years back on another coaster, if a restraint is closed and is only resting on a person's stomach, there is a real risk of the person's stomach popping out over the restraint during times of negative g's. This leaves the restraint loose around their mid-section until it is either pushed down by the rider or by positive g's later in the ride.
My instinct tells me that this rider's body became loose in the restraints during the double-down maneuver, and was ejected seconds later as the train went into the overbanked turn.
Time will tell....
Very sad thing, though.