If her core temperature had reached 32 degrees Fahrenheit or below, the water in her cells would have begun to freeze, forming ice crystals that would destroy cellular structure.

The damage would have been irreversible.

Her organs would not have recovered.

The fact that her organs did recover — that she walked out of the hospital with nothing worse than some frostbite to her toes — strongly suggests that her core temperature, however dangerously low it fell, did not fall to the point of cellular freezing in her vital organs.

What the external observers saw — the rigid skin, the hard extremities, the gray appearance — was the result of freezing in the peripheral tissues.

The extremities froze.