Who is Aunt Dorie Kay from My Louisiana Sky and what is their importance?

Aunt Dorie Kay is Corrina's little sister. She is also Tiger's aunt. Tiger describes her aunt as stylish and sophisticated, she is employed as a secretary for Governor Earl K. Long. Dorie Kay's relationship with Granny is somewhat strained because she feels guilty about Corrina's brain injury. When Corrina injured herself, Granny blamed Dorie Kay. In the end, Tiger goes to Baton Rouge to live with her aunt permanently.