Obeah

On a near-future Earth decimated by plagues, two species of humanity survive-Homo sapiens and Homo gaians. When an insane gaians blames sapiens for the world's problems, only Lauren Tom will stand between him and the destruction of the remaining sapiens.

Unless she decides he's right.
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Lauren Tom survived the Troubles that killed her father, survived her mother's disappearance ten years ago and now, at 23, she survives on her own in a cabin in the Yukon wilderness.

What she may not survive is learning that her mother belonged to a different species and that she herself may soon be insane, if those who suddenly want to kill her don't get to her first.