Two South Carolina women have been charged in a hit-and-run crash that left a small child severely injured, and one of the women is the child's mother, officials said Thursday.The collision happened about 10:30 p.m. on March 2 in the Five Points area on South Pinckney Street, police said.Beri Alizabeth Ayers, 23, the driver, was charged with hit-and-run with great bodily injury, an arrest warrant said.The child's mother, Katey Grace Gregory, 25, faces a charge of unlawful conduct toward a child, the warrant said.Police previously said Ayers was heading north on South Pinckney Street when she approached and drove through the intersection of Union Boulevard, hitting the child who was crossing the road. They said Ayers left the scene.The five-year-old boy was taken to Prisma Health Greenville Children's Hospital to be treated for his injuries.No official update on the child's condition was released.Police said Ayers came forward two days after the incident and was cooperating with investigators and the South Carolina Highway Patrol.Police said according to surveillance video, the child was trying to cross the road by himself when the incident occurred.The arrest warrant said Gregory "placed her small child at an unreasonable risk of harm by allowing the small child to cross all three streets alone at night."Police said the charges come after an "extensive investigation" by Union Public Safety and the South Carolina Highway Patrol.