Who is Corrina Parker from My Louisiana Sky and what is their importance?

Corrina is Tiger's developmentally disabled mother. She was not born with her disability, but rather suffered a brain injury when she fell from a tree as a small child. Since the accident, Corrina has remained in the mental state of a six-year-old, something that leads her to chase boys at the school picnic and cry like a child when she's injured. Corrina's behavior is a great source of embarrassment for Tiger.