Mongolian authorities are expected to interview her again on Wednesday or Thursday.
Foreign Minister Bob Carr said the Australian Consul-General to Mongolia, David Lawson, would accompany Ms Armstrong to the second round of questioning.
"She hasn't been detained, she hasn't been arrested, her passport hasn't been taken from her," Senator Carr told ABC Radio.
He said he had not been advised about any allegations against Ms Armstrong, but it was a complex matter between the company she works for, the resources authority of Mongolia and its anti-corruption authority.
"Australia's got big investments there, we're the biggest investor in mining," he said.
"Our relationship with Mongolia is very good."
Senator Carr said he expected the issue to be resolved quickly.
He would not comment on speculation Ms Armstrong had been targeted as a payback for making allegations of corruption three months ago.
news.com.au 24 Oct 2012
The government is coming to the 'rescue' of Sarah Armstrong, in the interest of the multi billion dollar company Rio Tinto.
It is all about the money and the corruption it buys.
When Julian Assange exposed government fraud, corruption and murder, there was no sending out of the Consul-General, David Lawson, but rather total detachment by all Australian politicians.
Obviously they have something to gain from Assange's incarceration, the leaking of documents pointing to their fraudulent operations no doubt.
The Australian Prime Minister, then went on to say publicly the Assange committed illegal acts, what ones were they again, Ms. Gillard?