The disappearance of a mother in South Australia’s far north is being treated as suspicious.

Trisha Graf, 41, was last seen in the Roxby Downs area almost a month ago with her Ford Territory found abandoned east of Andamooka on the day she went missing.

South Australia Police have grave fears for her safety.

Trisha Graf, 41, was last seen in the Roxby Downs area almost a month ago with her Ford Territory found abandoned east of Andamooka on the day she went missing. (SA Police)

Graf had been with friends at the Roxby Downs hotel until at about 12.30am on Friday, December 12.

The pair hit a kangaroo on the way home a short distance from the Andamooka township.

After striking the kangaroo Trisha and her friend continued onto Andamooka where they visited a home in the north-western area of the town.

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Trisha Graf left the pub with a friend in her white 2012 Ford Territory with the licence plate S254BCX and drove to a home in north-western Andamooka. (SA Police)

At 2am Graf left to travel a short distance home and was last seen alive driving along Dunstan Drive.

Her car was found abandoned near Blue Dam just after midday.

“This is highly unusual and particularly out of character for her,” South Australia Police Detective Superintendent Darren Fielke said.

“The dam has been searched by police divers, polair has been involved in aerial searching and we’ve also utilised specialised drone equipment,” Fielke said.

“Police have spoken to a number of people and in Roxby Downs who have assisted piecing together the movements of Trisha.”

Detectives are now urging anyone who saw Graf in the hours before her disappearance on December 12 to contact them.

The remote opal mining town of Andamooka is gripped by anguish as the disappearance of 32-year-old mother Trisha Graf takes a darker turn, with police revealing chilling new details that have intensified fears for her safety and left her two young children in a silent, heartbreaking plea for their “mummy” to come home.

Trisha Graf was last seen in late December 2025 at her home in the outback community, where she lived with her partner and their children, aged 5 and 7. Described by detectives as a “very good” and devoted mother, Graf maintained a pristine household and close family bonds. Yet her sudden vanishing — with no contact to her children or partner, bank accounts untouched, and personal belongings left behind — has raised alarming red flags.

Superintendent Des Fielke of South Australia Police confirmed the case is now treated as a major crime. “There has been no activity on her accounts, no communication — this is completely out of character,” he said. “The home was left in order, as if she intended to return. We believe someone knows exactly what happened.”

The chilling twist: investigators have uncovered evidence suggesting Graf may have been in distress prior to disappearing, with witnesses reporting unusual activity near the property. While details remain limited to protect the inquiry, police have appealed directly to the public, stating the truth may be “closer, and more confronting, than anyone imagined.”

Graf’s partner has cooperated fully, but the lack of leads has deepened the mystery. The children, too young to fully grasp the situation, have been cared for by relatives, their innocent questions — “When is Mummy coming home?” — piercing the hearts of those around them.

Andamooka, a tight-knit but isolated community of around 300 residents, has rallied with searches and vigils. Opal miners and locals describe Graf as warm and family-oriented, with no known enemies or reasons to flee.

As the investigation expands — including forensic analysis of her home and vehicle — police urge anyone with information to come forward anonymously. “For the sake of her children,” Supt Fielke said, “we need answers.”

What began as a disappearance is now a major crime probe, with fears growing that time is critical. For two young children waiting in silence, the plea remains unspoken but deafening: Mummy, please come home.