She falls in and is flushed away

Hermione’s flimsy limbs are nothing more than dry strips of wrinkled jerky now, not even bones left to hold their shape. As she sinks into the toilet, her legs bend at what would have been painful angles to let her lightweight body slip into the toilet. She can’t fight it, no muscles remain to squirm, no bones are left to brace herself with. She lets out a weak and breathy moan as she slides into the drain and is quickly flushed away.

After only a few moments, where Hermione sat there is nothing, no trace of the greatest witch of her generation.