Stiff as a board pretty much says it. She did not faint.
As I mentioned earlier or in another thread it looks exactly how people can faint/pass out. Not everyone just crumbles to the ground immediately. Often times, people get light-headed, start to wobble from dizziness and weak legs and then pass out. I've witnessed people swaying and trying to get their bearings and then collapse...just like this video showed.
That said, add up her VERIFIED concussion, blood clot, corrective lenses glasses, thyroid problem, her age and weight, tripping, now fainting, not to mention her moments of a 100 yard stare. It's obvious the woman definitely has a debilitating disease or syndrome. The root cause remains speculative.