[Normally this would all sound like Complete Bullshit, but for one, look at her, for two, look at Korra's waterbending, and for three, the idea that so long as there's brain activity of some kind someone can be dead and also not dead at the same time hits way too close to home. Literally.]

...You must have access to some particularly advanced medicine for such a thing to be possible.

You also must have had a life before you encountered this infection. A different name, for instance.