As stated above, a syncopal episode is a brief loss of consciousness and posture. Basically it occurs as a result of a brief decrease in cerebral perfusion. Given what the press is now reporting, yes, that is what happened. As I mentioned in my previous post, syncope can result from a wide variety of causes. Currently, it is categorized into 2 main categories...cardiac causes and noncardiac causes. Cardiac causes range from arrythmias to heart attacks among others. Noncardiac causes range from neurologic problems, something called vasovagal syncope, and orthostatic hypotension (low Blood pressure), which includes dehydration.
Basically all I was saying before was that her "fall" COULD be as simple as dehydration and thus not associated with the experience on MS at all. Given how fast she was treated and released, I very much doubt it was anything much more serious such as a cardiac or neurologic cause. But you are right, I wasn't there and I don't know the exact cause. But given the new bits of info that are now being released, imo the media jumped on this one with no obvious need to beyond the recent events associated with MS.