Oh, I see -- you mean the bullet-proof vest she sometimes has under her top when in situations where one of the right-wing loons might take a pot-shot at her? That strikes me as a reasonable precaution.
If so, it would have to be a brain injury that somehow managed not to noticeable impede physical function, since she's regularly pictured in public without any evident physical impairment, and also a brain injury that did nothing to impact her speech or her intellect, judging by the way she utterly demolished Trump in each of the debates. I'd be more concerned, if I were you, about what has gone wrong in Trump's brain. If you compare Trump's media appearances from a decade or two ago to today, the decline is breathtaking. He was always a blowhard and an ignoramus, devoid of a shred of moral sense, but he could carry a sentence from beginning to end without getting distracted, and he didn't use the crutch of endlessly repeating short stock phrases and filler words. I'm not sure if it was a stroke, dementia, or whether we're seeing the result of some sort of substance abuse, but something has gone terribly wrong with him, mentally. He communicates like an addled ten-year-old now. Granted, for those who have the mental faculties of a ten-year-old, that makes him appealing, but it's a stark decline from how he functioned even into his early 60s.
No. She'll eventually sicken and die, like everyone. But, judging by what we saw in the 2016 campaign, she was quite strong at the time. We see less of her today, so we can't be as sure she's still strong, but we have no reason to think otherwise, either.
