The restrictions will remain in place until midnight on Wednesday, June 30.
"Unfortunately, a number of people who contracted the virus have done so in a very fleeting way, literally being within less than a metre [of] somebody but sharing the same airspace without any physical contact", Berejiklian said.
She also flagged she was in the process of mandating the use of QR codes at all retail outlets.
"I expect the Minister for Covid-19 to give you an update later this afternoon", she said.
NSW Health said she was linked to the Bondi cluster but further investigations were under way.
Anyone who attended Bondi Junction Westfield between June 12 and June 18, including the auto parks, is now being asked to get a test.
Those people do not need to isolate, but the test is a precaution to contain the Delta strain outbreak.
Three new cases were recorded before the 8pm reporting cut-off, in addition to two infections that were announced yesterday. Another seven cases were recorded after deadline which will be included in Wednesday's tally.
The three new cases reported in the period to 8pm on Monday, included a woman in her 60s in the Illawarra and a woman in her 40s from Sydney's northern suburbs who had both been in isolation as they were close contacts of previously reported cases.
Victoria required anyone from most of inner Sydney was required to get tested and isolate until they received a negative result.
Testing numbers were up to 28,645 by 8pm on Monday night compared to 25,252 the previous day.
There was an unlinked case of a primary school student from a St Charles in Waverly in Sydney's east, which is in the same geographical location as Bondi Junction though there is not a link yet.
The premier was asked if health authorities were considering a lockdown to which Ms Berejiklian said she was following the advice of Chief Health Officer Dr Kerry Chant.
Dr Chant said this case and the woman who works at Bondi Junction were the only two cases officials were concerned about when it came to transmission. "We also need to recognise that this Delta variant.is actually a gold medallist when it comes to jumping from one person to another", Berejiklian told reporters in Sydney.
Hundreds of people are isolating after scores of exposure sites were identified across more than a dozen suburbs.
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