Paramedics were called just after 10pm and the woman was rushed to the St Vincent’s Hospital in a “critical condition”, the New South Wales ambulance service said in a statement.
Staff at the venue, as well as a bystander, looked after her until emergency services arrived. “We treated her on scene to injuries to her face and head,” the ambulance service added.
The woman was placed in an induced coma but died on Tuesday (21 November), the hospital announced.
An Allianz Stadium spokesperson said the woman was climbing over chairs when she slipped and fell down six rows of seats. The incident happened at the end of the show, when thousands of fans were making their way out of the stadium.
“Rather than using stairs, the woman attempted to step over seating rows. She lost her footing and fell,” the stadium spokesperson told the Sydney Morning Herald.
“This is a terribly sad incident and our thoughts and wishes are with the patron and their family during this time.”
Williams is yet to comment on the incident, which took place on the first day of his XXV Australian Tour.
The day after the concert he took to social media to thank nearly 40,000 Australian fans who were present at the stadium for “an unforgettable evening”.
He is touring Australia for the first time since 2018, following the release of a Netflix documentary, Robbie Williams, which charts his rise to fame as the youngest member of 90s pop band Take That, then as a solo star.
Swift said she was “overwhelmed by grief” after a 23-year-old fan named Ana Clara Benevides died before her concert in Rio de Janeiro. Benevides fainted before being revived at the Estádio Olímpico Nilton Santos last Friday.
She was taken to the hospital where she later died of a cardiac arrest, according to the Brazilian daily Folha de S Paulo.
Another fan, identified as 25-year-old Gabriel Milhomem Santos, was stabbed to death just hours after attending the Rio de Janeiro concert.