Lindy Chamberlain-Creighton arrived in Darwin on Thursday, for a fourth inquest into the death of nine-week-old Azaria Chamberlain more than 30 years ago.
Azaria was last seen sleeping inside a tent when she went missing at Uluru in 1980.
The latest coronial inquest into her death begins in Darwin on Friday.
Michael Chamberlain and Ms Chamberlain-Creighton have always maintained a dingo took their baby.
The official cause of death is still registered as unknown.
The ABC reports the Chamberlains want Azaria's death certificate officially changed.
They have provided written submissions to the Northern Territory coroner.