The Catawba County grand jury handed up the one-count indictment charging Elisa Baker the same day Hickory police confirmed a prosthetic leg found last week belonged to Zahra, the Hickory Daily Record reported.
The 42-year-old stepmother "unlawfully, willfully and feloniously did with deceit and intent to defraud a police investigation, obstruct justice by constructing and placing a false ransom letter and reporting an abduction of her stepdaughter, Zahra Baker," the indictment states.
She remains jailed under a $92,200 bond.
Zahra Baker was reported missing Oct. 9 and police started calling it a homicide investigation three days later, the Record said. No one outside the family has reported seeing the girl since Sept. 25.
Zahra had lost her lower left leg and part of her hearing to cancer. Her hearing aids were found in the family's home and the prosthetic leg was found Oct. 26 in brush off a rural road in Caldwell County.
"The medical records matched the serial numbers on this prosthesis," Hickory Police Chief Tom Adkins said.
Friends and relatives had said Zahra and her father, Adam Baker, came to the United States from Australia, moving into a rented house in Hickory this fall along with Elisa Baker, who met Adam Baker online.