Tiana Savignano appeared at Liverpool Local Court on Tuesday where she had her bail conditions tightened.
The 22-year-old will no longer be allowed to sit in the driver's seat of a vehicle after the added condition was applied for by police prosecutors and agreed to by her lawyer Layal Zbib.
Savignano's partner Johnson Kokozian, 20, was allegedly behind the wheel of a speeding Mercedes SUV that smashed head-on into a car containing siblings Alina Kauffman, 24, and Ernesto Salazar, 15, in southwest Sydney earlier this month.
Both siblings were killed in the Heckenberg crash.
Savignano was initially arrested and charged with hindering the investigation into the crash after turning up at court to support her boyfriend.
Police allege that she, Kokozian and his father discussed a cover story and made false reports to investigators.
Savignano was also slapped with 31 driving offences unrelated to the deadly crash, including speeding, drink driving, using a mobile phone while driving and having an unrestrained child in a car.
She will next appear for those matters at Liverpool Local Court on October 9, when a plea will be entered.
Savignano has also been hit with a separate charge of illegally filming part of a court hearing.
She will enter a plea to that offence at Parramatta Local Court on October 10.
The 22-year-old will also appear at Campbelltown Local Court on November 1, when she will receive the prosecution's brief for charges relating to her alleged concealment of the Heckenberg crash.
Kokozian's friend Cruz Pamoana Davis-Tuka has also been charged with helping conceal the crash.
He will appear at Liverpool Local Court later on Tuesday.
Kokozian has been charged with aggravated dangerous driving occasioning death due to the alleged excessive speed.
Police allege he fled the scene after crashing the Mercedes-Benz AMG while travelling at nearly double the speed limit for the 50km/h zone.
