Katrina Prahastono, 34, had been on the phone to a friend at the time she lost control of her car on the Hume Highway at Menangle Park, crashing into a truck and killing her and her two children.
Katrina Sila, 34, and her son, two, died when their SUV veered into a cement truck on the other side of the Hume Highway in south-west Sydney. On Wednesday, her baby girl died in hospital.
A mother was making final preparations for a religious celebration for her newborn when she was tragically killed alongside her son in a horrific car crash - with her baby dying days later.