I actually believe the pneumonia thing and the dehydration.
The leg wobble looks like someone unsteady on their feet and trying to keep balance. I've seen plenty of drunks do the same wobble. I've been taken out by overheating and dehydration enough times to know how unsteady I can get before I hit the deck.
What causes me to raise an eyebrow is that they knew she was sick Friday. Instead of coming out with it straight off and having her cancel appearances and rest, first they lie, then they lie again and it takes all day for them to finally admit that she was actually sick. Now, I don't know about you but saying, "Yeah, severe allergies lead to pneumonia and she needs to rest and get better." is a much better way to deal with both the fact that she's under attack for lack of transparency and her health than getting caught in a really stupid lie about it.
Plus, the fact that in addition to being to stupid to use a computer, figure out classified emails, she's is also apparently too stupid to take basic care of herself and her health.
If her allergies lead to pneumonia, she can't help that, but being so stupid that she didn't know to take it easy and got dehydrated because of it, that makes the state of her health actually pertinent. So, she might not drop dead of some covered up health issue, instead she drops dead because she doesn't take care of herself. It's not really an improvement.