Megan Fackler told Ewing police officers who responded to the crash she was following directions to her brother's house where she was going to live following her divorce.
Asia Brown, of Trenton, is charged with murder and leaving the scene of a motor vehicle accident resulting in the death of Caldner Bell, also of Trenton.
Matthew Hertgen has been in custody since his arrest on Feb. 22, after allegedly attacking and killing Joseph Hertgen in the family's Princeton residence.