Tuima, who was part of Devonport Services’ successful under-18 squad last season, is one of just three new players in the England 26-strong squad.
She earned her place after impressing at a training camp last month.
England Women’s Under-20 head coach Jo Yapp said: “We have had a very successful three-day camp at RAF Cosford with the squad last month and the two weeks together will provide the players with a further opportunity to train and play in an international team environment.
“We have a really exciting group of players coming through and we look forward to taking on Canada, who will provide us with tough competition.”
England’s matches against Canada Under-20s will be played on August 18, August 22 and August 26 at Nottingham Trent University.
After moving up from under-18 level, Tuima is set to play for Plymouth Albion this coming season. Also in the squad is former Plymouth player Lottie Holland.
England U20 Squad
Name (Club, University (Test caps, U20 caps))
Holly Aitchison (Lichfield (0, 2))
Zoe Aldcroft (Darlington Mowden Park, Northumbria University (2, 5))
Sarah Bern (Bristol, University Of Gloucestershire (2, 4))
Jessica Breach (Pulborough (0, 1))
Amy Cokayne (Lichfield, Loughborough University (16, 1))
Hollie Cunningham (Cleve, Hartpury College (uncapped))
Abigail Dow (Wasps (0, 3))
Sydney Gregson (Bristol, University of Bath (3, 5))
Zoe Harrison (Saracens (0, 3))
Lottie Holland (Bristol, University of Bath (0, 5))
Poppy Leitch (Bristol, University of Exeter (6, 2))
Caity Mattinson (Darlington Mowden Park, Northumbria University (0, 1)
Molly Morrissey (Lichfield, Hartpury University (0, 1))
Ellie Mulhearn (Cleve, Filton (uncapped))
Rebecca Noon (Lichfield, Nottingham Trent University (0, 6))
Lucy Nye (Lichfield, Loughborough University (0, 5))
Catherine O’Donnell (Waterloo, University of Liverpool (0, 5))
Ellena Perry (Saracens (0, 3)
Kelly Smith (Worcester, Hartpury University (0, 3))
Sally Stott (Edinburgh University (0, 3)
Katie Trevarthen (Lichfield, Coventry University (0, 4)
Lagi Tuima (Plymouth Albion (uncapped)
Hannah West (Wasps, Brunel University (0, 3)
Anna Wolf (Darlington Mowden Park, Northumbria University (0, 2)
Millie Wood (Lichfield, University of Gloucestershire, (3, 8) ©
Rachael Woosey (Darlington Mowden Park (0, 3)