It looked bad, all right … but the longer Riddle stood there, the more life was dwindling out of Ginny … and in the meantime, Harry noticed suddenly, Riddle’s outline was becoming clearer, more solid ….
There are no more uses of "dwindle" in the book.
Show samples from other sources
Her savings dwindled down
I started the diet with good intentions, but my resolution dwindled over time.