Ranjna is the co-founder of Auckland's Nirvana Health Group, New Zealand's largest independent primary health care network. She has extensive involvement in charitable and community groups for which she received a QSM in 2009 and ONZM in 2017. Nirvana Health Group is an innovator in primary mental health care and support.
In December 2014, in partnership with Counties Manukau Police and Sahaayta Counselling and Social Support, Ranjna established New Zealand's unique violence prevention programme, Gandhi Nivas. Gandhi Nivas tackles family violence by providing counselling and emergency housing to men referred to the service by police.
Ranjna won IBA Businesswoman of the Year for 2011, has been inducted into the Co.OfWomen Hall of Fame, won the Deloitte Top 200 Visionary Leader award for 2016 and the 2016 EY Entrepreneur of the Year Master Category.