Jean Huang, 35, died in hospital on Friday after she was allegedly administered a local anaesthetic and breast fillers by Jie Shao, 33, at the Medi Beauty Laser and Contour Clinic in Chippendale, in Sydney's inner-city, on Wednesday afternoon.
Ms Huang suffered cardiac arrest during the procedure and was rushed to hospital in a critical condition but died two days later.
Shao, who does not have an Australian medical licence, was initially charged with causing reckless grievous bodily harm and using poison to endanger life.
But on Tuesday the Central Local Court heard she now faces an additional charge of manslaughter.
Court documents allege Shao "injected Jean Huang with varying amounts of anaesthetic in the form of Tramadol and Lidocaine and the restricted substance hyaluronic acid".
The court previously heard Shao was a graduate of a Canton medical university and a specialist in dermatology who had practised in China and Great Britain.
She had arrived in Australia four or five days before the alleged offences with two Chinese passports because her tourist visa - which expires in November - was attached to her old passport.
Shao will remain behind bars and is due to return to court on October 31.
