The Cajun Girl: Part 1 by Sharon A. Austin

She survived a horrific childhood only to wind up trapped in a bitter, loveless marriage. Determined to find independence BJ Donovan, a French Quarter restaurateur, pens a work of fiction. Her book is a hit. But not for long. While interest in her debut crime novel continues to wane she comes up with a plan for how to top the bestseller list again. Using her position as a young executive chef to blend in with the community, she embarks on a killing spree, by means of witchcraft, and uses details of the murders to begin the first book in a thriller series.