A young mother-of-two charged over her alleged role in a gangland shooting is a long-term employee of an organisation aimed at reducing youth incarceration rates.

Terleaha Williams, 20, was allegedly involved in the shooting up of a Mount Druitt home, in Sydney's west, during the early hours of May 9 this year.

The Frank Street property was allegedly peppered with 26 rounds of rifle fire at 1.15am -  just moments after alleged bikie Taniela Moeakiola arrived to visit relatives. 

Seven adults and four young children were home at the time, but no one was injured. 

It was the second shooting incident at the property, following a previous event in 2021 when Moeakiola was also present. 

Following a seven-month investigation, detectives executed a search warrant at a Mount Druitt property about 6am on Tuesday and arrested Williams.

She was charged with allegedly firing a firearm at a house in the course of an organised criminal activity, participating in a criminal group or contributing to criminal activity and possessing an unregistered firearm. 

Her two co-accused, Steve Mate, 30, and Christopher Leonard, 31, were arrested earlier this month.

Terleaha Williams, 20, (pictured) has been charged over her alleged involvement in a joint criminal enterprise

Dressed in a white t-shirt and dark pants, Williams fidgeted in her seat as she appeared in court on Wednesday, gazing around the room, yawning, and playing with her hair. 

At one point she leaned forward in her chair, propping her elbows on the top of her knees then resting her chin in the palm of her hands. 

Applying for bail, her lawyer Cassandra Giudice told the court Williams was a mother of two children - aged four and two - who is mentally vulnerable due to a diagnosis of ADHD. 

She said Williams' children are currently in the care of her mother, who recently had a stroke and has a heart monitor. 

Ms Giudice argued Williams' alleged involvement was 'minor' and she is not accused of shooting or holding the gun.

Ms Giudice said the police case was strong based on phone calls and admissions, but there was a 'sizeable hole' concerning the absence of the weapons.

The court heard Williams has worked for five to six years as a data officer for Just Reinvest NSW - an organisation aimed at reducing Aboriginal people’s interactions with the criminal justice system. 

The court also heard she has a criminal history, including numerous warrants and breaches of bail, but had never served time in prison. 

Dozens of bullets were fired into a Mount Druitt property in May 

Detectives launched a months-long investigation into the incident, resulting in three arrests this month