Deathless Divide by Justina Ireland

After the fall of Summerland, Jane McKeene hoped her life would get simpler: Get out of town, stay alive, and head west to California to find her mother.
But nothing is easy when you’re a girl trained in putting down the restless dead, and a devastating loss on the road to a protected village called Nicodermus has Jane questioning everything she thought she knew about surviving in 1880’s America.

What’s more, this safe haven is not what it appears – as Jane discovers when she sees familiar faces from Summerland amid this new society. Caught between mysteries and lies, the undead, and her own inner demons, Jane soon finds herself on a dark path of blood and violence that threatens to consume her.
But she won’t be in it alone.
Katherine Deveraux never expected to be allied with Jane McKeene. But after the hell she has endured, she knows friends are hard to come by – and that Jane needs her, too, whether Jane wants to admit it or not.

Watching Jane’s back, however, is more than she bargained for, and when they both reach a breaking point, it’s up to Katherine to keep hope alive – even as she begins to fear that there is no happily-ever-after for girls like her.