Executive Secretary of UN ESCWA 2010-2017 - Rima Khalaf

Why did a UN agency publish a report that categorised Israel as an apartheid state? Rima Khalaf was Executive Secretary of the United Nations Economic and Social Commission for Western Asia until March 2017. She commissioned a report which accused Israel of systematically implementing apartheid policies and promptly resigned from her UN post when the Secretary General refused to accept the work. What were her motives?