Kewley won her first award for a documentary about the South Korean human rights situations in 1977. She began planning "Tibet: A Case to Answer" in 1985 and the project was approved by Channel 4's commissioning editor David Lloyd. Kewley entered the country via a tourist group and initially shared amateur filming equipment with the cinematographer Sean Bobbitt before he became ill. She returned to Tibet three years later to film a follow-up but stopped film making after being diagnosed with parkinson's disease in 1993. Kewley however returned to nursing and worked for the Red Cross in Bosnia and the United Nations High Commissioner for Refugees during the 1994 Rwandan genocide.