There is a plan afoot here.

The medical escape is a no doubt a cleaner way of getting out of the race before the rest of the email feces breaks loose from the oscillator.

No conspiracy theory at all. Just the usual political tactical jockeying to try and fool the public.

Her growing unfitness is becoming more of a liability than the party will tolerate. I would guess many (?) in the party would welcome a clean way to get her out of the way.