A minor tear to her left calf on April 29 sidelined the all-rounder for the early part of the season and a recurrence of the injury a fortnight ago meant Sciver-Brunt missed World Cup hosts England's last three group-stage matches.Her absence made little difference as England topped their group with five wins out of five but that did not prevent Sciver-Brunt from pulling out all the stops in a bid to be fit for the knockout stages, including placing her left leg in a portable machine which uses electromagnetic energy to alter cell behaviour.The 33-year-old batted for half an hour in the Oval nets on Wednesday but did not take part in any fielding drills, raising questions over whether she is indeed fully fit to lead England against the Proteas at Surrey's headquarters on Thursday.But Sciver-Brunt told reporters: "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 (the injury) 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."'Vibes are high'Charlie Dean has led England to three successive wins but will now return to the ranks, with batter Sophia Dunkley, who came into the side following Sciver-Brunt's injury, likely to drop out.