It was subtle at first. For the first several months, she assumed it was merely the stress of the war; for the next several months, she assumed it was the stress of the trials; then when winter approached, she assumed it was stress from school.

She kept assuming it was stress until she was walking to the cabinet to retrieve her supplies for Potions class and the walls began closing in, wobbling and swallowing her up.

When she woke again, she was in the Hogwarts hospital ward.

Severus Snape stood at her bedside, staring down at her with an expression of profound irritation.