A woman, who was high on drugs when she crashed her car in the NSW Blue Mountains and killed an 11-year-old boy, will spend at least two years behind bars.

When Michelle Currey got behind the wheel of her boyfriend's Holden Commodore in the early hours of Sunday morning on the November 27 2016, she knew she was affected by drugs including ice and cannabis and was groggy with fatigue. Despite this, she chose to drive.

Minutes after her drive began, she lost control of the vehicle on The Bells Line of Road at Bilpin. She crossed onto the wrong side of the road and collided with a tree.

Michelle Currey, 45, will spend at least two years in jail for the death of an 11-year-old boy in a crash NSW Blue Mountains in 2016. Picture: 9NEWS. (9NEWS)

Currey was critically injured, her boyfriend Craig Woodyatt was badly injured and his son, Logan - who was sitting in the rear of the car - sustained horrific head injuries.

The 45-year-old told detectives at the time of the incident that she saw a face in the trunk of a tree that startled her as she was driving, resulting in the fatal crash.

Logan Woodyatt suffered fatal head injuries when a drug-affected Currey slammed a car into a tree in Bilpin. Picture: Supplied. (Supplied)

Logan's father, Craig, was also in the vehicle at the time of the crash and came away with serious injuries.

The young boy however - remembered by his family as "bright and always happy" - was pulled from the wreckage of the crash and spent three days in an intensive care unit in hospital battling horrific brain injuries until he died.

Logan's heartbroken family were in court today for the sentence. Acting Judge Madgwick addressed the family directly when he said, "this sentence must seem to you to be very inadequate."

The young boy spent three days in an intensive care unit in hospital battling horrific brain injuries before he died. Picture: Supplied. (Supplied)

He went on the say, "no amount of punishment can ever heal the family's suffering."

Currey's lawyer told the court she turned to drugs because her boyfriend would call her a "junkie" and that she was depressed when they broke up.

When asked by the judge, "what do you think of your actions?", Currey replied, "disgusted".

Logan's father was also a passenger in the vehicle and came away with serious injuries. Picture: 9NEWS. (9NEWS)

The court was also told Currey weighed 80 kilograms before the accident, but her weight had blown out to 140kg due to stress, depression and anxiety.

When Acting Judge Madgwick asked if she was "out of her mind" when she drove that day, she responded with a tearful "probably sir."

Outside court, Logan's Aunty Melissa told Nine News, "he would have been 14 by the time she gets out. She has experienced everything and she gets to breathe and do normal things."

Currey told detectives at the time of the crash that she saw a face in the trunk of a tree, became startled and crashed the car. Picture: 9NEWS. (9NEWS)

Last year, Melissa told A Current Affair Logan's family waited until the final moment to see whether he would make a recovery in hospital.

"When the brain started swelling and he had surgery later that night, they (Logan's doctors) pretty much told us the next morning that he wasn't going to wake up," she said.

"We gave him every opportunity to come back to us - we gave him about 36 hours - but he was already asleep for a little while then.

The 45-year-old driver was excluded from a court appearance last year because she was allegedly confined to a wheelchair but was later filmed walking around freely. Picture: 9NEWS. (9NEWS)

"The final time that I went in I was like, 'I have to say goodbye'. You never get taught how to say goodbye to a child when it shouldn't have happened."

Currey, who faced 11 charges for drug and driving offences, was excused from attending an earlier court appearance last year because she was allegedly confined to a wheelchair.

Footage later released by A Current Affair however, showed Currey walking around freely without the wheelchair.