Geraldine's original experiences in Cambodia never left her and while in Australia in 1993, Cox helped found the Australia Cambodia Foundation, which operates Sunrise Cambodia today. She moved to Cambodia permanently in 1995 where she worked as an Executive Assistant for the Cabinet Director in the Cabinet of the then First Prime Minister of Cambodia, HRH Prince Norodom Ranariddh. In her spare time Geraldine assisted Princess Marie, the wife of Prince Norodom, in operating and supporting a residential education centre for orphaned children. When a military coup occurred in July/August 1997 Geraldine realised her position of responsibility in looking after the children of the orphanage, as Princess Marie and her political associates had fled the country to save themselves. Within the orphanage she became widely known to the children as "M’Day Thom" (meaning Big Mum) Geraldine's unwavering support for the orphanage during the tumultuous political period of the military Coup led her to be recognised as a prominent humanitarian figure.