‘Ma’: Spencer is a terrific villain, but she’s stuck in a clunky story

“Ma” – “Get home safe.  That’s all I care about.” – Sue Ann (Octavia Spencer) “Don’t make me drink alone.” – Sue Ann Erica (Juliette Lewis) and her high school-aged daughter Maggie (Diana Silvers) drive towards a small-town destination, and a single-stack nuclear power plant looms over the endless acres of leafless, dormant trees.  Little did they know that their lives would soon blow up, after Erica decided to move back to her hometown and into a modest three-bedroom ranch that sits on a dead end street. They should have…