Lincon Pearce, 19, and Ava Slowik, 19, appeared in the Bendigo Magistrates' Court on Monday after they both pleaded guilty to the December 24 carjacking.

The court heard Pearce, Slowik, and two teenage boys lured the victim to Slowik's home in the early hours of Christmas Eve.

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The four offenders entered the victim's car and instructed the woman to drive around the Kangaroo Flat area.

The court heard when the group arrived at a secluded part of Birds Reef Lane, the victim was told she was "going to get rolled" and that she was "f*****".

One of the teens punched the victim to the face, causing her glasses to fly off.

When the woman did not get out of the vehicle, Slowik dragged the victim by her hair and pushed her onto the ground.

The four offenders then drove off in the stolen car. They could be heard laughing as they drove away, the court was told.

Magistrate Russell Kelly noted the injured victim had been left isolated in bushland in the dark early hours of the morning.

Slowik was arrested later that day and made admissions, telling police she had taken a large amount of prescription medication before the carjacking.

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Pearce handed himself into officers on January 15. He similarly told police he had been under the influence of several illicit and prescription drugs during the offending.

Mr Kelly said he accepted that the pair had been drug-affected.

The magistrate said he also took into account Slowik's "tragic background" of drug use and mental health issues, along with the fact she had recently given birth.

But Mr Kelly said he was not satisfied any of those factors meant she should not serve a term of youth detention.

The magistrate made the same determination for Pearce.

Mr Kelly said he recognised the 19-year-old had an ongoing drug problem, despite having the support of his family and employment.

Slowik and Pearce were both sentenced to six months in youth justice detention.

Slowik's seven days of pre-sentence detention were reckoned as served, as was Pearce's five days in custody.

Slowik's lawyer indicated she would appeal her sentence and the 19-year-old was granted appeal bail.

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