Arlene Saper was arrested around 3 a.m. at the school on Kildaire Road in Chapel Hill.
Further details about the incident have not been released.
Police release identity of shooting suspect, victimMary Scroggs Elementary has recently been in the news after a woman was shot several times while waiting outside the school last Friday afternoon. Forty-year-old Chahnaz Kebaier later died at the hospital.
Police said the shooting was believed to be related to an ongoing domestic dispute between Kebaier and 49-year-old Ali Cherfaoui, of Carrboro.