A Perth drunk driver who crashed her car after trying to scare a moped rider, killing her teenage daughter who was in the boot, and injuring three others, has been sentenced to four-and-a-half years in jail.

Janet Kirby, 48, was twice the legal alcohol limit when she lost control of her car in the northern suburb of Merriwa in March last year.

She had been playing drinking games with her daughter Lois, 15, before driving the teenager and four friends to a party in Perth's northern suburbs.

However Kirby lost control of the vehicle after swerving across the road to try to scare the moped rider and his pillion passenger.

Lois, who with one other passenger was travelling unrestrained in the luggage compartment, was thrown from the vehicle on Marmion Avenue and died.

Kirby lost control of her car after swerving in the direction of a moped rider and his passenger. ( ABC News )

Police who attended the scene smelled alcohol on Kirby's breath, and she later recorded a blood alcohol level of 0.11.

District Court Judge Linda Petrusa called the crash a "tragedy" but said it was "a tragedy that could have been avoided".

"You failed in your responsibility at the first hurdle and compounded it by deliberately skylarking," Judge Petrusa told Kirby.

She described Kirby's actions as "deliberate" and a "grave breach of the standards" expected by drivers on the roads.

"As wretched as the death of Lois is ... it cannot be forgotten your actions caused injuries to three others," Judge Petrusa said.

"And you placed at risk the lives of ... two others in the car and the two young people on the moped."

Judge Petrusa said while she accepted Kirby was genuinely remorseful and suffering significant emotional pain, a message had to be sent to the community that driving was a "privilege" and motorists needed to take into account the safety of others.

Kirby will have to serve a minimum of two-and-a-half years behind bars before she can be released on parole.