The 28-year-old is one of only 30 people selected from around the world for a week-long Roots and Shoots symposium run by the Jane Goodall Institute.
''It's amazing, so amazing. I'm thrilled,'' Ms Mackenzie said.
''I [can't wait] to hear what other people are doing around the world in terms of conservation and education [and] to hear other people's philosophies and techniques about helping the world,'' she said.
The Jane Goodall Institute, led by famous chimpanzee welfare campaigner Dame Jane Goodall, started the Roots and Shoots global youth programme in 1991 to inspire and empower young people to make the world a better place.
Roots and Shoots was launched in New Zealand last year in a collaboration between the Orokonui Ecosanctuary, Dr Goodall, University of Otago professor Phil Bishop and pupils from six Dunedin secondary schools.
Ms Mackenzie said she was hoping to share some of the work she had done with the ecosanctuary and school pupils over the past six years.
''I'm hoping to show the other leaders the ways they can start up Roots and Shoots through schools.
''We [Orokonui] have a lot to offer.
''What I'm hoping is that Orokonui can be a ... hub for the programme,'' she said.
After spending a week at St George's House inside Windsor Castle, Ms Mackenzie would continue on in England the following week on a self-directed educational tour.
