Jessie Moore appeared in Melbourne Magistrates' Court today, pleading guilty to one count of murder.
Moore was heavily pregnant when she was charged with the murder of her 69-year-old aunt at a Devon Meadows home on May 25 last year.
The court previously heard Moore may have an intellectual disability.
The greyhound trainer's death sent shockwaves throughout the Victorian racing community, with many paying tribute to the beloved trainer.
Friend and chair of Greyhound Racing Victoria, Peita Duncan, previously described Ms Leek as a "fantastic person" loved by the whole racing community.
"She was an amazing person, it's such a massive loss for us," she said.