Reba is headed to Lifetime...Miranda has good news... Reba McEntire will play a judge in the Lifetime movie, The Hammer. The movie is based on a tough, real-life lawyer, who is appointed judge in Nevada after her predecessor died under mysterious circumstances. Reba's boyfriend, Rex Linn, and her former Reba co-star, Melissa Peterman, also star in the movie. No word on when The Hammer will air. Good news from Miranda Lambert. Her mother, Beverly, is now cancer-free. Beverly was diagnosed with breast cancer in September and has undergone treatment. Miranda tells People, "I was able…