Saanvi was in her grandmother's care Monday, when someone entered their sixth-floor home in the Marquis Apartments, on Dekalb Pike near Kings Circle, killed the grandmother, Satayvathi Venna, 61, and kidnapped Saanvi. Authorities say that the attack happened between 8 a.m. and 1 p.m. State Police issued an Amber Alert, and the FBI has joined the investigation.