COLUMBIA, S.C. — An adult mother and daughter are in jail after attacking three students at a Midlands middle school Wednesday, the Sumter County Sheriff’s Office said. Sumter residents Whitley Smith, 32, and her mother, Mamie Smith, 67, were each charged with third-degree assault by mob and disturbing schools, the sheriff’s office said in a Thursday news release. The women went to Ebenezer Middle School in Dalzell to confront a child who they accused of bullying a family member, Sheriff Anthony Dennis said. At about 2:30 p.m., the school’s resource officer called the sheriff’s office for back…