The woman arrived at the Wellington Street office about 9.30am and locked her hand in a concrete barrel to protest against the treatment of asylum seekers on Manus Island.
Police issued the woman with a move-on notice but she has refused to leave.
She was joined by other protesters waving signs saying all they wanted for Christmas was freedom.
The signs also feature a naughty list, which included Prime Minister Malcolm Turnbull and Federal Immigration Minister Peter Dutton.
“We’ve tried years of people protesting, lobbying, writing letters but I think people in this group feel that it is necessary to escalate these protests because the voices of the people on Manus and Nauru haven’t been heard,” protester Michelle Bui said.
The woman’s hand was freed just after 4pm on Tuesday.
The protest group has vowed to continue going to extreme measures to highlight the asylum seeker message, and force the Federal Government to listen.
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