Kapp is one of the premier allrounders in women's cricket at the moment. She can be a match-winner with both bat and ball. She usually bats at No. 3, anchors the innings, then tees off. Bowling is probably Kapp's stronger suit though. She is fresh off a four-for in the warm-up game against Australia.
Vice-captain: Natalie Sciver
Sciver is another fine all-round option. She generally bats in the top four and opens the bowling for England which means she can get you points with both bat and ball. In T20Is, she averages 23.51 and has a strike rate of 111.48 with the bat, and she has 56 wickets at an economy of 6.44.
Jones is an opener who doesn't like wasting too many balls in the powerplay if she can help it. If she gets going, England will be in a great position. She can get you points for wicketkeeping as well, so she is a must-have. She has scored 200 runs in her last seven T20I innings and has a career strike rate of 113.13 in the format.
Dane van Niekerk
A proper legspinner-cum-top order batter. Her ability to keep things tight makes her effective - she has an economy of 5.46 in T20Is, especially impressive given she bowls legspin. She warmed up for the tournament with a 51-ball 62 against Australia.
Yet another allrounder who usually bats in the top four and bowls a bit. She is more of a batting allrounder, so she may not be the best choice for captain or vice-captain, but you cannot leave her out. She is 54 short of 1000 runs in T20Is and has a career strike rate of 116.21.
Luus can play the role of finisher, and contribute with a bit of legspin. She picked up four wickets in the first warm-up game against Sri Lanka, and could trouble the England batters.
Points to note
South Africa have won only two out of their last 10 T20s against England
England have scored at 7.07 against legspinners in the format since 2017, and South Africa have two legspinners in their squad