When spoken to by police, Thompson said she had been coerced into buying the items for a man who threatened to harm her.
"If you feel leaned-on or threatened all you need to do is find a phone and ring 111," Judge McGuire said.
Thompson had also entered a guilty plea to a charge of burglary at an earlier appearance.
The burglary charge relates to an incident when she was driving her stepfather's car on December 5 with two associates in the car.
She parked the car in the driveway of a Petrie St property while the two associates broke in and took televisions from the house.
Judge McGuire referred Thompson to a restorative justice programme to make peace with her stepfather and other family members and ordered a pre-sentence report before she came back to court for sentencing on May 30.
"You are in serious trouble," Judge McGuire said.