"We've beaten every team ranked above us apart from Germany, so we're getting closer," said Powell.
Yankey goal wins Cyprus Cup for England
"But what the very top teams do is produce consistent performances and results, and that's what we have to start doing.
"In Cyprus we played well against Italy, not so well against Scotland and only in the second half against New Zealand before we did really, really well in the final.
"So for me it's ideal that we're playing Canada again so quickly, to see whether we can produce the same level of performance and hopefully the same result."
Three players have withdrawn from Powell's squad through injury, most crucially perhaps Arsenal striker Kelly Smith.
But Smith, arguably the best-ever English female player, also missed the Cyprus Cup final and that was won convincingly despite the tight scoreline.
England's most capped - men
Peter Shilton: 125 caps
David Beckham: 115 caps
Bobby Moore: 108 caps
Sir Bobby Charlton: 106 caps
Billy Wright: 105 caps
Powell said: "When a player of Kelly's capability gets injured it's not so much a problem as it once was, because we now have much greater strength in depth.
"We showed that in the Cyprus Cup final, hopefully we'll show it again on Sunday and - even more importantly - at Euro 2013 in the summer."
Bardsley (Lincoln), Brown (Everton), Chamberlain (Bristol Academy), Bassett (Birmingham City), Bonner (Liverpool), Bradley (Lincoln), Harrop (Birmingham City), Houghton (Arsenal), A. Scott (Arsenal), Stoney (Lincoln), Susi (Chelsea), Unitt (Birmingham City), Asante (Gothenburg), Clarke (Lincoln), Moore (Birmingham City), Nobbs (Arsenal), J. Scott (Everton), F. Williams (Liverpool), Yankey (Arsenal), Aluko (Chelsea), Duggan (Everton), White (Arsenal), R. Williams (Birmingham City).
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.