In the third Twenty20 match at Derby, Sophie Ecclestone shone with the bat, and the ball as England easily defeated South Africa by 38 runs to win the match and the series.
The 23-year-old batsman led England to a commanding 176-6 with a career-best 33 not out off 12 balls.
After that, she scored 2-24 points while South Africa had trouble answering.
Even though Tamzin Brits put up a fight with 59, the visitors could only manage 138-6 from their 20 overs.
The result gives England a 14-2 triumph before the opening of the Commonwealth Games on Friday after they had won all six of the white-ball games in the multi-format series after the Test match ended in a tie.
After the opening ball of the game struck the in-form Sophia Dunkley, 17-year-old Alice Capsey smashed a brisk 25 from 17 balls, helping England pass 50 in the powerplay for the third straight game despite losing two wickets.
Nonkululeko Mlaba, who scored a career-high 3-22, sometimes made England seem in trouble. Still, Ecclestone’s vivacious cameo, which included 26 runs in the last over that included two massive sixes, helped them to a sizable total.
The second 17-year-old in the England team, Freya Kemp, took 2-18 in her debut for her country, and South Africa never seemed like they would go close to that total.