Nielsen once moved to the number one rankings in T20Is in 2014.
With the six sixes, Harmanpreet became only the 2nd player in the history of Kia Super League (6) to hit as many as six sixes.
Smriti Mandhana brought up her maiden century in the Twenty20 format off 61 balls.
The left-hander has scored 282 runs in five innings and has an average of 56 in the tournament.
Mandhana also scored the fastest T20I fifty for India Women off 25 balls earlier this year.
She also became the joint-fastest batsman to score a half-century in Women's T20s.
She is in great form in the shortest format of the game.
Smriti was very excited after accepting the offer and termed it as a real honour.
Cross was completely oblivious to her presence during celebrations
Southern Vipers won the inaugural edition of the Kia Super League by defeating Western Strom in the final.