Yulia Skripal, who is recovering after being poisoned together with her father, former Russian spy Sergei Skripal, in England last month, said Wednesday she does not want assistance from the Russian Embassy.
Zakharova also accused Britain of waging a campaign to discredit Russian Federation.
Its ambassador Alexander Yakovenko called Britain's response "quite odd, to put it mildly" as he criticised the UK's refusal to grant consular access to Ms Skripal.
"Today the worldwide chemical weapons watchdog have confirmed the findings of the United Kingdom relating to the identity of the toxic chemical used in the attempted assassination of Skripal and his daughter, and which also resulted in the hospitalisation of a British police officer".
Britain, meanwhile, has called on the U.N. Security Council to convene a meeting to discuss the report, according to a tweet from Britain's mission to the United Nations.
"We are not allowed to see our citizens, talk to doctors, have no idea about the treatment the Russian nationals receive".
Ms Skripal was discharged from Salisbury District Hospital on Monday (April 9th) having spent five weeks being treated after she was poisoned in the city, alongside her ex-Russian spy father Sergei Skripal.
Russian Federation denies involvement, and says Britain hasn't shared any evidence for its assertion. Britain has blamed Russian Federation for the attempted murder - a charge that Moscow has strongly denied.
The embassy expressed surprise that the statement had been published at Scotland Yard's website instead of being read out by Yulia on camera.More news: Xi makes surprise visit to fleet in South China Sea drill
Johnson told German broadcaster Deutsche Welle on March 20 that "the people from Porton Down" were "absolutely categorical" that the source of the nerve agent used against the Skripals was Russian Federation. Former KGB bodyguards identified as suspects in the murder denied any involvement.
The Novichok class of nerve agents was developed in the Soviet Union toward the end of the Cold War, and Britain says it has evidence Russian Federation has continued to manufacture Novichok agents in the last decade.
Sergei Skripal was imprisoned in Russian Federation for selling secrets to British intelligence in the 1990s but was exchanged in a spy swap in 2010.
"This transparent and open approach, which we have pursued from the outset, is in sharp contrast to the Russian state's ongoing tactics of obfuscation and distraction", the spokesman said.
"The code word used for the offensive chemical weapons programme (of which the Novichoks were one part) was FOLIANT", he said.
It added that "the toxic chemical was of high purity". A new analysis from the global oversight organization that enforces chemical weapons treaties doesn't directly name names, but the report falls foursquare behind the analysis of the UK's own investigators.
If the pair were secretly resettled, the opportunity to hear their version of events would be lost, the embassy said.
The embassy accused British authorities of "concealing important evidence and blocking an impartial and independent investigation" by isolating the woman.