The Hind
Novelette 11,017 words Recommended by 2 award/anthology sources
"A twinge of nausea rose, but Kym drove it back, swallowed in a dry throat, and looked down at the list again... The whole idea of a list of targeted names sickened her, but this had to be done. It would require all her strength and more fortitude. She had never killed anyone before."
Quasar links out; the story lives on Asimov's, where the author gets the click.