Sarah Thomas in semis despite GB defeat by Netherlands
The 31-year-old and her team-mates face Argentina in Wednesday's semi-final while reigning champions the Netherlands take on New Zealand.
Thomas has played in all GB's Pool A games, scoring in their opening 4-0 win over Japan.
She is also taking part in a second Olympics, having played at the 2008 Beijing Games.
GB were already assured of a semi-final ahead of the clash with the Netherlands after China's hopes ended with a 1-0 defeat by Japan earlier in the day.