Very good, Possum! She's currently head of the United Nations Development program.
Apologies to the non-Australasians - I realise we're an obscure little nation.
But I think one more of these should be guessable, so here are a bunch more clues:
- current NZ ambassador to the USA
- former Director-General of the WTO
- shares a name with someone a good deal more famous in the US