Maia Bouchier top scored with 23 while Danielle Gibson added 21 late as England were skittled in the 19th over.
The innings could not have got off to a worse start as Danni Wyatt planted a gentle wide delivery from Inoshi Fernando straight to cover.
The Sri Lankans were celebrating again at the end of the second over when a calamitous mix-up between Bouchier and Alice Capsey saw both batters at the same end, with the latter ran out. Bouchier and captain Heather Knight did some repair work, sharing a 30-run stand in four overs, but that came to an end when Bouchier holed out to long-on.
Knight and Amy Jones soon followed as England slipped to 72 for five in the 11th over and it looked like they would struggle to get to 100. But Gibson hit three fours in her 15-ball innings to get them to three figures before a flurry of late wickets saw them fail to see out their overs.
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