England 172 for 2 (Jones 86*, Beaumont 40) beat New Zealand 168 (Plimmer 43, Smith 3-30, Sciver-Brunt 2-31, Capsey 2-34) by eight wickets
An injury to key bowler Sophie Ecclestone proved no barrier for England as Amy Jones overhauled a meagre target to send New Zealand out of the World Cup with a heavy defeat.
Ecclestone injured her bowling shoulder while fielding and sent down just four deliveries, including a wicket, before England bundled New Zealand out for 168 inside 39 overs in their final group game.
Her fellow left-arm spinner, Linsey Smith, overcame a difficult start to capture three wickets while part-time off-spinner Alice Capsey and seamer Nat Sciver-Brunt took two each before Jones's unbeaten 86 took England home with ease.
The result meant that England secured the No. 2 spot behind Australia, meaning that in the unlikely event of their semi-final against South Africa being washed out in Guwahati on Wednesday and on the subsequent reserve day, they would progress on the basis of holding a superior position on the table.
It also ensured there would be no fairytale farewell for New Zealand captain Sophie Devine, who has played her last ODI in a match where New Zealand's batters collectively failed convert starts and their bowlers struggled to put dents in England's top-order.
On the face of it, England had an easy ride into their semi-final campaign, but Ecclestone's injury was cause for concern and they had to overcome a wayward start with the ball and in the field while their re-jigged middle-order went untested.
The openers Jones and Tammy Beaumont broke the back of the run chase with a 75-run partnership and Jones combined with Heather Knight for an 83-run stand that took England within 11 runs of victory.
England's top four have all scored runs at this tournament, with Knight and Sciver-Brunt posting centuries and Beaumont and Jones reaching fifty before this game. Down the order they brought in the vastly experienced Danni Wyatt-Hodge for her first match of the tournament, replacing Emma Lamb who has struggled at No. 6.
Knight's dismissal, lbw to Devine for 33, prompted England to send Wyatt-Hodge in at No. 4 ahead of Sciver-Brunt to give her some exposure in the middle ahead of the knockout phase, although it was limited as she faced seven deliveries for 2 not out.
Beaumont raced to 26 off 20 balls, with four of her five boundaries up to that point coming in one Jess Kerr over. Back-to-back fours off Amelia Kerr put Beaumont in touching distance of 40 but, once she arrived there, she was struck on the pad by a Lea Tahuhu nip-backer right in line with middle stump.
Knight carved the next ball expertly through backward point for four and, having overturned an lbw dismissal to New Zealand's bemusement as Melie Kerr's delivery was shown to be going over the stumps, Knight advanced down the pitch to power a huge six over long on in her next over.
All the while, Jones had been steadily creeping towards her half-century with excellent timing and she brought up the milestone with six off Suzie Bates. Jones upped the tempo and helped herself to three fours in a row off Rosemary Mair before eventually bringing up the winning runs with consecutive boundaries off Devine, who left the field through a guard of honour from both teams.
Earlier, Ecclestone took a tumble trying to intercept a boundary from Bates off the second ball of the match and jarred her shoulder after running from mid-off to chase Capsey's misfield at extra cover.
Bates only managed to reach 10 before spooning a waist-high full toss from Smith straight to mid-off where Lamb stood as a substitute for Ecclestone.
Struggling to grip the new ball, Smith continued to serve up some wayward lengths and, after Bates had failed to capitalise, Kerr did with four boundaries on the trot as she set about rebuilding through a 68-run partnership alongside Georgia Plimmer.
With Smith pulled from the attack and Ecclestone still off the field having her injury assessed, Capsey entered to make a crucial strike as Kerr sought to go big down the ground and picked out Charlie Dean, who then struck with the first ball of the next over, pinning Plimmer on the pad for 43 as England wrested back control.
Ecclestone returned briefly to remove Brooke Halliday, caught by Sophia Dunkley at deep midwicket, but then Dunkley bowled the remaining two balls of the over as Ecclestone, feeling more discomfort in her shoulder, left the field for the remainder of the innings.
So it fell to Devine to make one last stand with the bat, even more so when Capsey took an excellent diving catch off her own bowling to remove Maddy Green - although she dropped another off Izzy Gaze next ball - but it wasn't to be. Devine managed 23 off 35 before she strode forward to a Sciver-Brunt off-cutter which kissed the inside edge before landing in the glove of wicketkeeper Jones.
Smith returned in the 29th over and, more comfortable with the worn ball, removed Gaze playing around a slow, full delivery that angled in to hit the top of off stump.
Sciver-Brunt grabbed her second wicket by pinning Mair lbw and Jess Kerr was run out by a good throw from Dean at extra cover to Jones to put New Zealand on the brink of being bowled out. Dean finished it with a superb catch over her shoulder while running back at mid-off to remove Tahuhu and give Smith her third.
