The 29-year-old has been in a coma since the horror collision, which also claimed the life of the driver of the other vehicle involved, 50-year-old Craig Whitehall.
Jessica underwent a number of surgeries, including having one of her kidneys and part of her skull removed, but remained in a coma.
The revelations come as former Home and Away actress remains in a critical condition at St George Hospital after her life support was turned off.
Lars and Vivian died instantly, and Annabelle passed away in hospital three days later.
The actor was critically injured in the New South Wales crash, which killed her parents Lars, 69, and Vivian, 60.
Jessica's family made the heartbreaking decision to turn off her life support just one day after the funeral of her father Lars, mother Vivian and sister Annabelle.
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Camera IconFriends and family at the funeral for Lars, Vivian and Annabelle Falkholt at Concord Today.
Both Jessica and Annabelle were pulled from the burning wreckage and taken to hospitals. The Daily Telegraph reports that Whitall had many previous driving infractions, including a nine-year ban and had at least 10 convictions for driving without a licence.
Home And Away actress Jessica Falkholt is said to still be in a critical condition despite being taken off life support.
28 year old Jessica Falkholt has been clinging to life since her family's auto collided head-on with a 4WD driven by a man we now know was on his way home from a methadone clinic.
Ponticello also spoke about the love between his sister and brother in law, "They are together and always will be".
Harmony was the last movie Jessica filmed before the horror crash last month.