Christopher Dolan tells The Associated Press that 13-year-old Jahi McMath left the hospital in a private ambulance shortly before 8 p.m. Sunday.
Dolan says she was taken while attached to a ventilator but without a feeding tube. Her destination was not immediately disclosed.
David Durand, the hospital's Chief of Pediatrics, says the girl was released to the coroner. Durand said in an email the coroner then released her into the custody of her mother, Nailah Winkfield, as per court order.
A judge said Friday that the mother may remove the girl from the hospital if she assumes full responsibility for the consequences.
The teen suffered cardiac arrest after bleeding profusely following her operation earlier last month.