Kaur muscled her way to a 37-ball 51 at the Sawai Mansingh Stadium to take the team steps away from the win.
Williamson also won the International Test player of the year award as well as The Redpath Cup for First-class batting.
Jess Jonassen has bagged nine wickets in two matches in this series.
Here are all the stats and records created and broken by New Zealand and their new opener.
The teenager is all set to become the youngest ever White Ferns’ player in the history of the World Cup.