In 1990, Kewley's only book entitled "Tibet: Behind the Ice Curtain" was published. She returned to Tibet in 1991 by smuggling herself into the country across the Himalayas hidden beneath the floorboards of a van to create the follow-up to "Tibet: A Case to Answer," entitled "Voices from Tibet" shown on Channel 4. Kewley revealed martial law was still present in Tibet despite claims from China that it had been ended. She stopped producing documentaries when she was diagnosed with Parkinson's disease in 1993. However Kewley returned to Charing Cross Hospital in the early 1990s to undertake a refresher course before travelling to perform work for the Red Cross in Bosnia and the United Nations High Commissioner for Refugees during the 1994 Rwandan genocide. She adopted and sponsored the education of two girls from Tibet and one boy from Rwanda. On 14 October 2000, Kewley married the soil scientist Michael Lambert and the marriage ended with Lambert's death from bone cancer four years later. She died of pneumonia and Parkinson's disease on 17 July 2012 at Chelsea and Westminster Hospital. Her adoptive children survive her.