Australia await the winners in Sunday's final at Lord's.
A minor tear to the England captain's left calf on April 29 sidelined Sciver-Brunt for the early part of the summer and a recurrence of the injury a fortnight ago led to her missing England's last three group-stage matches.
While England, like the Aussies, topped their group with five wins out of five, Sciver-Brunt has been working tirelessly behind the scenes to make sure she would be back in the XI for the sharp end of the tournament.
As well as the usual tricks to speed up recovery such as eating right, taking supplements, wearing compression socks and undergoing physiotherapy, she has undergone magnetic resonance therapy, placing her left leg in a portable MRI-like machine which uses electromagnetic energy to alter cell behaviour.
The 33-year-old batted for half an hour in the nets on Wednesday morning but did not take part in any fielding drills, leaving question marks over whether she is ready to lead England at the Oval.
But Sciver-Brunt said: "I've been put through my recovery paces and worked really hard to get myself to this position. Everything has gone to plan as well as it could do.
"We used various different methods to get the recovery right. Even things that have a small chance of working. We literally threw everything at it.
"We tested it enough to be comfortable. What will happen out on the pitch will happen. I'm really happy with where I am at, physically. We're confident that I'm fully fit."
Charlie Dean has led England to three successive wins but will now return to the rank and file, with Sophia Dunkley, who benefited from Sciver-Brunt's injury to come into the side, likely to drop back out.
It would be harsh on Dunkley, who top-scored with 57 against Scotland and put on an unbroken 128 with Danni Wyatt-Hodge as England laid down a marker ahead of the knockouts by thrashing New Zealand on Saturday.
England are favourites to advance although South Africa have form for upsetting the odds, beating Sciver-Brunt's side in the semi-finals of the 2023 edition and last year's 50-over World Cup.
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