Campbell was charged with assault in New York City last week for allegedly throwing her cell phone at a housekeeper. The 35-year-old supermodel was released on her own recognizance and allowed to keep her passport.
Her lawyer said Campbell needed her passport for a trip to South Africa to visit Mandela.
Vegter said that as far as she knew, Campbell had now left South Africa.
UNICEF is organizing a visit by Jones, who won the U.S. Fund for UNICEF's 2005 Spirit of Compassion Award. Photos of the 73-year-old composer-conductor visiting Mandela were released Monday.
Jones is to meet with young artists and musicians on the challenges they face in an era of AIDS, crime, sexual violence and drug abuse.
UNICEF said Jones would also learn about efforts to improve child survival and to prevent mother-to-child transmission of the AIDS virus.
One of the programs of the Quincy Jones Listen Up Foundation is an intercultural exchange between underprivileged youths from Los Angeles and South Africa. The charity works to connect young people with technology, education, culture and music.