(Preble County, OH)--The Preble County Sheriff’s Office is investigating a missing person case focused on a 49-year-old woman who functions at the level of an eight-year-old.  Amy Evans lives on Quaker Trace Road and has not been seen since Friday.  Investigators say she is believed to have been picked up near her home by a man in a dark blue mid-sized vehicle.  She is not responding to calls to her phone.