As of shortly after noon Friday, a previous link to the report yielded an error message and the report was not listed among the publications on the website for the ESCWA, an agency based in Beirut, Lebanon that is comprised of 18 Arab member states, including what is identified as the State of Palestine.
The US, which is one of Israel's key allies, also criticised the report.
"We expected of course that Israel and its allies would put huge pressure on the secretary general of the United Nations so that he would disavow the report, and that they would ask him to withdraw it", she added.
Hezbollah leader Sayyed Hassan Nasrallah said in a televised speech on Saturday that the incident served as a reminder of the "truth of this organization, that it's weak. and it succumbs to the will of the United States and Israel".
Khalaf, who was appointed as under-secretary general and executive secretary at the ESCW by Ban Ki-moon, the former United Nations secretary general, said Guterres had forced her to resign, Press TV reported.
UN Under- Secretary General Rima Khalaf resigned her position Friday in response to the furor caused by the publication of a report that accused Israel of imposing an "apartheid regime" on Palestinians.
Khalaf told a press conference in Beirut on last Friday that she had resigned as a result of lobbying by UN Secretary-General, Antonio Guterres, to withdraw a report from the ESCWA website upsetting United States of America and its ally, Israel.
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The accusation-often directed at Israel by its critics-is fiercely rejected by Israel.
The UN is "incapable of taking a stand" and the debacle over the report proved it can not be counted on "to defend human rights in our region", he said.
ESCWA published the report on Wednesday and said it was the first time a United Nations body had clearly charged that Israel "has established an apartheid regime that dominates the Palestinian people as a whole".
US Ambassador to the UN, Nikki Haley also praised the resignation and condemned the report.
"It's only normal for the criminal to attack those defending the cause of his victims, but I can not accept being subjected to such pressures", she told reporters in Beirut, quoting from her resignation letter.
UN Spokesman, Stephane Dujarric stressed to the media that the issue was not the content of the report, but rather the process used in publicizing it.