20-year-old Gabriella Engels is being assisted by the organisation after she was assaulted in a Sandton hotel on Sunday.

JOHANNESBURG - Lobby group AfriForum is giving the National Prosecuting Authority (NPA) three months to prosecute Zimbabwe's First Lady Grace Mugabe for assault, saying that if this doesn’t happen it will take action itself.

Gabriella Engels, 20, is being assisted by the organisation after she was assaulted in a Sandton hotel on Sunday, allegedly by the first lady.

AfriForum's advocate Gerrie Nel says that the organisation is prepared to represent the alleged victim Gabriella Engels.

Gabriella's mother Debbie Engels says she is now confident that they will get justice.

Grace Mugabe was supposed to hand herself over to the police on Tuesday but the Zimbabwean government has instead invoked diplomatic immunity.

#GraceMugabe Adv Nel - "we're monitoring this situation and if we feel that it's not going accordingly - we will intervene". HM — EWN Reporter (@ewnreporter) August 17, 2017

#GraceMugabe AfriForum says the family was told to come up with their own settlement amount. But rejected the offer. HM pic.twitter.com/HXYhkyVIjP — EWN Reporter (@ewnreporter) August 17, 2017

#GracMugabe Adv Nel says the family is not interested in a settlement. He says therefore that they will press for justice in law. HM pic.twitter.com/vvndNDUsKj — EWN Reporter (@ewnreporter) August 17, 2017

WATCH: AfriForum outlines plan to support Grace Mugabe's alleged assault victim