Erin ChamberlinA 12-year veteran of Caesars Entertainment Corp. was named Monday as the new general manager of Horseshoe Casino Baltimore, which says it has regained momentum after struggling to overcome fallout from the city's April riots.Erin Chamberlin, 40, comes to Baltimore from Planet Hollywood Casino & Resort in Las Vegas, a 2,500-room Caesars hotel and casino where she was vice president and general manager. Horseshoe, where she will start in mid-December, is 41 percent owned by Caesars Growth Partners. Rock Gaming owns 29 percent and other investors own the balance. Chamberlin will succeed Chad Barnhill, who announced this month that he is leaving in December to head Horseshoe Casino Cincinnati. Like its Horsehoe Cleveland counterpart, that casino is leaving the Caesars family and will soon be wholly owned and managed by Rock Gaming. Chamberlin, whose appointment requires the approval of state regulators, has a marketing background that could prove useful as Horseshoe Baltimore's general manager and senior vice president. She spent 2005 to 2011 with Caesars in Atlantic City, N.J., in a variety of roles, including vice president of marketing for Caesars and Bally's in that resort city.