Sentnor, who plays for Massachusetts club South Shore Select, is the only 2004 player on a 20-player roster otherwise comprised of 2003s.
The USA faces host China on Friday and the Czech Republic on Sunday.
U.S. U-15 girls national team
GOALKEEPERS (2): Nadia Cooper (Shattuck-St. Mary's; Katy, Texas), Neeku Purcell (Reign
Academy; Seattle, Wash.).
DEFENDERS (6): Baleigh Bruster (NTH Tophat; Smyrna, Ga.), Andrea Kitahata (San Jose Earthquakes; Hillsborough, Calif.), Aidan McConnell (Michigan
Hawks; Dexter, Mich.), Ayo Oke (NTH Tophat; Lawrenceville, Ga.), Kellie Pagador (Placer United SC; Roseville, Calif.), Lilly Reale (South Shore Select; Hingham, Mass.).
MIDFIELDERS
(6): Emma Egizii (Beach FC; Downey, Calif.), Tatiana Fung (Legends FC; Fullerton, Calif.), Riley Gleason (So Cal Blues SC; Mission Viejo, Calif.), Annie Karich (So Cal Blues SC; Surfside,
Calif.), Devin Lynch (Sockers FC; Naperville, Ill.), Jillian Shimkin (FC Fury NY; Rockville Centre, N.Y.).
FORWARDS (6): Simone Jackson (LAFC Slammers; Redondo Beach, Calif.),
Karlie Lema (MVLA SC; Morgan Hill, Calif.), Arianna Manrique (NTH Tophat; Buford, Ga.), Allyson Sentnor (South Shore Select; Hanson, Mass.), Farrah Walters (SC del Sol; Scottsdale, Ariz.), Amelia
White (Fort Wayne United FC; Fort Wayne, Ind.).