The Flagler County Sheriff’s Office arrested a 13-year-old girl and her grandmother following an investigation into an incident at Ralph Carter Park that began as a reported theft and escalated into charges of false imprisonment and written threats to kill, according to a news release.According to FCSO release, the conflict began May 24, when the teen, 13, of Palm Coast, attempted to provoke a fight at the park, pulling a victim’s hair before th…