Mother of Darkness by Christina McMullen

With the Eclipse project disbanded and the government still keeping secrets, the former hunters are co-opted into the outreach effort aimed at convincing the mods to change their ways. Lucy Soriano is pleased that the focus has shifted from killing vampires to saving them, but soon learns that some of the hunters are having a harder time transitioning than others. Even worse, the organization is thrown into chaos when an unknown enemy begins targeting vampires and making threats against the hunters, and Lucy finds herself inexplicably suffering from a mysterious illness.
Piecing together the puzzle out of false leads and whispered rumors just leaves Lucy with more questions than answers. Is the government behind the attacks or are The Eyes of The Sun once again on the rise? Or is New Orleans in danger of falling to a new and unknown power? But most importantly, will Lucy survive long enough to discover the truth?