NASHVILLE — When South Carolina and Mississippi State met in an all-Southeastern Conference national championship game last season, it underscored the league’s dramatic transformation in the post-Pat Summitt era. Anyone watching SEC women’s basketball for the first time since Summitt stepped down in 2012 would hardly recognize it. “There’s no denying there has been a lot of change in the Southeastern Conference,” said Andy Landers, who coached Georgia from 1979-2015 and is now an SEC Network analyst.