Already happened on at the 9/11 Memorial.
they had a back view and the dude blocked her before she went full horizontal. nobody could see the seizure face.
If/when it happens again, there will be 100 cameras trained on her looking for every twitch.
If she falls, onstage, or off the podium, it's over. outside of that, if they catch her and it's vague, they sell it as dehydration.