Zahra, who lost a leg and much of her hearing in a childhood battle with bone cancer, was reported missing Oct. 9, but police believe she had disappeared weeks before that date.
On Oct. 27, police found a prosthetic leg and matched the serial number to the one she used.
Abandoned by her biological mother in Australia when Zahra was an infant, her father later married Elisa Baker and moved to United States.
Relatives and neighbors said that Elisa Baker was abusive to Zahra, who was often bruised.
Police allege that in the hours after Zahra's parents reported her missing, Elisa Baker allegedly penned a bogus $1 million ransom note.
Before Zahra's body was found, Elisa Baker was indicted for obstructing justice, a charge stemming from the ransom note. She is in jail awaiting trial.
Two weeks before police found the girl's remains, Elisa Baker indicated in a jailhouse letter that the child was dead, but expressed no remorse or guilt.
In November, during the course of the investigation, police learned Elisa Baker was still married to another man when she married Adam Baker.
"In Australia when you get married, you have to provide proof of divorce and stuff and she showed some divorce papers from a previous marriage. So as far as I knew, she'd only been married that one time before," Adam Baker told WBTV. "I've come to find out I was the seventh. That's a bit of a shock…she has a history of doing this kind of stuff, manipulating everybody in her life."
Elisa Baker's first husband reportedly lived across the street from the couple.
"She always told us it was her brother and then, after they moved out, I found out it was her old man," neighbor Bobby Green told ABC affiliate WSOC.
ABC News' Lee Ferran contributed to this report.