Which country demanded the return of an american woman with diplomatic immunity who was involved in a deadly collision?

Britain  demanded the return of an american woman with diplomatic immunity who was involved in a deadly collision.

Explanation:

The country that wanted the woman from America who was part of the crash that also led to a death was Britain.That crash led to the death of a teen age who was from Britain and the woman who was responsible for this was the wife of a diplomat from America who had left the country after that accident so the prime minister of Britain demanded that woman to come back to Britain.