A Perth woman who robbed a bottle shop with her 14-year-old daughter, stole some bourbon and was caught hiding behind a rubbish bin has been jailed for more than two years.

The woman, who cannot be named, pleaded guilty to aggravated armed robbery and unlawful wounding.

The West Australian Supreme Court heard she entered a BWS store in February armed with a black-handled knife with a 10cm-long serrated blade.

Raising the knife at head-level, she approached an employee and threatened him with the knife.

She then picked up some bottles of bourbon before she was challenged by another employee.

The woman lunged with the knife at the employee who intervened, striking him underneath the shoulder blade, the court heard.

The two employees then retreated to the back of the store.

The woman fled the store with her 14-year-old daughter and another female, carrying the alcohol.

Police caught the woman a short distance away, after she tried to hide behind a rubbish bin in the front yard of a house.

The court heard the woman had little memory of what happened because she was tired, had been drinking and had consumed amphetamines.

She could not even recall having a knife, but accepted the facts when she saw the CCTV footage.

The woman was sentenced last week to two years and six months in prison but will be eligible for parole in April next year.

Her daughter previously pleaded guilty to aggravated robbery and received a six-month youth community-based order.

The third offender was charged with aggravated robbery but that matter has not been dealt with in court.