Carrion

dead and putrefying flesh(unfit for food)

noun

http://www.merriam-webster.com/dictionary/carrion

“Magda was dumb. Even the laugh that came when the ash-stippled wind made a clown out of Magda’s shawl was the only air-blown showing of her teeth. Even when the lice, head lice and body lice, crazed her so that she became as wild as one of the big rats that plundered the barracks at daybreak looking for carrion, she rubbed and scratched and kicked and bit and rolled without a whimper.” pg2300

I understand that Magda sort of lost all her human like qualities.