Dread Nation #1 by Justina Ireland

Trained at Miss Preston's School of Combat for Negro Girls in both weaponry and etiquette, Jane McKeene is poised for a successful career protecting the wealthy from the encroaching plague of walking dead. But when families begin to go missing, Jane uncovers a conspiracy that pits her against some powerful enemies. Sent far from home, Jane will need all her resourcefulness, wit and strength of character to survive.

Book by author Justina Ireland.