Regarding the eyewitness account... there's contradictions the statement she gave the press:
Carmen Brown of Arlington was waiting in line as the victim and her son were being strapped in for the ride.
“She was right in front of us, but we weren’t on the ride,” she said.“The lady basically tumbled over.”
If she wasn't on the ride, she couldn't have witnessed her tumbling over during the course of the ride.
Brown said the victim’s young son was in the seat in front of his mother.
“We heard her screaming. We were, like, ‘Did she just fall?’”
If they were in the station - which no doubt was loud and noisy, how did they hear her screaming? Also, if they were next to get on the ride, wouldn't they have been busy loading into the train? I have ridden the old Texas Giant, but the New Texas Giant has the same set-up. The train leaves the station facing AWAY from the course. It makes a 180 turn to the right and onto the lift (the same as Mean Streak) it then ascends the hill and the course is located to the far left of the station (on load side.)
Brown said she didn’t believe that the woman had been secured in her seat correctly.
Subjective
Brown said the victim expressed concern to a park employee that her harness only clicked once when it was lowered into place, unlike the multiple clicks heard when others were strapped in.
“He was basically nonchalant,” Brown said. “He was, like, ‘As long as you heard it click, you’re fine. Hers was the only one that went down once, and she didn’t feel safe. But they let her still get on the ride.”
Investigators were interviewing witnesses on the ride, some of whom reported that the woman had been thrown from the roller coaster as it rounded a turn.
This confuses me. Because of the high sides to the train, I wouldn't expect that she fell to the side. It would seem more likely that she'd fall forward or backward... and the witness even elluded to it "The Lady basically tumbled over."
None the less, time will tell. However I don't think we will gain accurate information based on such eyewitness accounts. Any NUMBER of things could have gone wrong. And often, such horrible tragedies are a result of several mistakes, errors or circumstances.