The defending champion U.S. team blanked Canada in the round-robin tournament opener and then downed Brazil 2-0 on Sunday.
Argentina, a late addition after Japan dropped out because of coronavirus concerns, did not win a match but did impress with gritty performances.
Rapinoe is the top SheBelieves career leader with seven goals, including three in this edition.
It was Lloyd's 124th international goal and it came in her 299th appearance with the national team.
“It's always nice to be recognized, but I think there were other people that deserved it more.”The United States improved to 4-0 against Argentina.