Louise Gavin, 36, of McGregors Road, was one of three people arrested by officers at a BP service station in west Warrnambool on June 27 this year.

A search of the offenders' vehicle uncovered 6.4 grams of ice on the floor of Gavin's seat.

A further 11.2 grams was located on the back seat, as well as $3910 cash and a set of digital scales.

Gavin told police she had an ice pipe and a small amount - one gram - of ice in her bra.

She pleaded guilty in Warrnambool Magistrates Court last week to trafficking and possessing methamphetamine.

The court heard Gavin made admissions to being in the car when a male co-accused was weighing quantities of drugs and counting cash.

She told police the man weighed a portion of ice, placed it in a bag and handed it to her to hold onto.

When the offenders were intercepted, she threw the bag weighing 6.4 grams near her feet, she told police.

Lawyer Amanda Chambers said the drug trafficking charge was made on the basis that Gavin helped the two co-accused weigh the drugs.

The co-accuseds are currently in custody and have not had their day in court.

Gavin also pleaded guilty to theft from shop, handling stolen goods and obtaining property by deception.

Those charges relate to the theft of a pair of earrings from Best and Less, as well as the use of a bank card stolen from an unlocked vehicle parked on Warrnambool's Kelp Street on February 2.

The bank card was used to purchase cigarettes, phone credit and alcohol totalling over $200.

Gavin denied stealing the bank card, stating she had received it from an acquaintance and used it to purchase the items.

"It was a stupid thing to do," she told police.

Her lawyer told the court that she had spent 120 days in custody on remand, was drug free and government housing was available upon her release.

"She acknowledges the challenge of breaking away from a peer group where meth use is ripe," Ms Chambers said.

"She knows any offending will see her yo-yoing back to (jail)."

Gavin told the court she believed she had served enough time.

"I know it's my fourth time in (jail) and it's getting to the point where I hate it," she said.

"This time I've been in for four months and I actually don't want to go back out and use (drugs)."

Magistrate Franz Holzer said Gavin had one last chance of getting her life back together.

"There is only one person who can control whether you get hooked back on the drug again and it's not me," he said.

Gavin was sentenced to the 120 days already served in custody and ordered to continue a therapeutic corrections order.

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