She said the request to Britain to accept diplomatic status for Assange was made on December 20, and denied a day later.
The foreign minister said: "Everything is being done in accordance with the law".
Britain said earlier on Thursday it had refused a request by Ecuador for Julian Assange to be given diplomatic status, a spokesman for Britain's Foreign Office said. The UK refuses to guarantee he will not be extradited to the US.
Assange posted a picture of himself wearing an Ecuador football shirt on Wednesday, which added to the speculation he had been received citizenship. The Australian became an Ecuadorian citizen on December 12. It reported that it had checked his identity number with the public database of Ecuador's internal revenue service.
Julian Assange, the Wikileaks founder, has been given an Ecuadorean passport and identity documents, fuelling speculation that he could soon be moved from the embassy in London.
Swedish prosecutors in May dropped their investigation into the rape allegations, but British police have said Assange would still be arrested if he left the embassy.
Ecuador's Foreign Ministry in a statement said it was seeking to resolve Assange's situation, without making reference to the citizenship issue.
In February 2016, the United Nations panel confirms its view that Assange has been "arbitrarily detained", saying he should be able to claim compensation from Britain and Sweden. WikiLeaks said that by staying as long as he had in the embassy, he had served more than 14 times the maximum sentence under United Kingdom law.
Ecuador's left-wing president Lenin Moreno, who took office in May, has been less friendly toward Assange than his predecessor Rafael Correa.
The moment he leaves the embassy, the United Kingdom is likely to arrest him for breaching his bail conditions when he sought asylum after losing his appeal.
What could happen to Julian Assange now?
" As things stand at the moment, I think there is really only two prospects for him", he said. In November Britain's High Court rejects an appeal against his extradition.
His continued political activism creates diplomatic headaches for Ecuador.
Moreno issued a warning reminding Assange not to meddle in politics. The WikiLeaks chief believes that the U.S. government is seeking his extradition and prosecution.