Sinead Ryan starts in the back row alongside, with Claire Molloy named on the bench.
With Tania Rosser ruled out of the tournament by a shoulder injury, Louise Beamish starts again at scrum half, while Joanne O'Sullivan moves to out-half in place of Helen Brosnan, who picked up an ankle injury in the win over Kazakhstan.
Shannon Houston forms a new centre partnership with Lynne Cantwell who won her 60th cap against the Kazakhs.
The girls in green beat the USA 22-12 in the pool stages as well as picking up a big win over Kazakhstan but they missed out on a top four spot on points difference.
They now face the USA again in a play-off to determine the 5th to 8th placings at the tournament. The winners of this game will take on either Canada or Scotland in next Sunday's 5th-6th place play-off.
IRELAND WOMEN'S TEAM & REPLACEMENTS (v USA Women, 2010 Women's Rugby World Cup play-offs, Surrey Sports Park, Wednesday, September 1, kick-off 4.30pm):
15 - Niamh Briggs (Clonmel/Munster)
14 - Amy Davis (Blackrock/Leinster)
13 - Lynne Cantwell (UL Bohemians)
12 - Shannon Houston (Blackrock/Leinster)
11 - Eliza Downey (Cooke/Ulster)
10 - Joanne O'Sullivan (Richmond/Exile)
9 - Louise Beamish (UL Bohemian/Munster)
1 - Fiona Coghlan (UL Bohemians/Leinster) (capt)
2 - Yvonne Nolan (Blackrock/Leinster)
3 - Gillian Bourke (UL Bohemians/Munster)
4 - Kate O'Loughlin (Clonmel/Munster)
5 - Marie Louise Reilly (Navan/Leinster)
7 - Sinead Ryan (Blackrock/Leinster)
8 - Joy Neville (UL Bohemians/Munster)
16 - Chris Fanning (Highfield/Munster)
17 - Louise Austin (UL Bohemians/Munster)
18 - Caroline Mahon (UL Bohemians/Munster)
19 - Carol Staunton (Galwegians/Connacht)
20 - Claire Molloy (Bristol/Connacht)
21 - Nora Stapleton (Old Belvedere/Leinster)
22 - Mairead Kelly (UL Bohemians/Munster)
Ireland Women's Rugby World Cup Results/Fixtures:
Pool B -
Ireland v USA, Surrey, Wednesday, September 1
Ireland/USA v Canada/Scotland, Sunday, September 5