It was the seventh goal of the season for Rodman, a Rookie of the Year finalist and the daughter of former NBA star Dennis Rodman. At 19, she is the youngest player to score in the playoffs.
Sanchez gave the Spirit the lead with a goal from a seemingly impossible angle off a corner kick.
The result for the Spirit comes amid a turbulent season. The team’s coach, Richie Burke, was dismissed in September for violating the league’s anti-harassment policy.
The Spirit also had to forfeit two regular-season games because of COVID-19 protocols. The Spirit were 2-1-0 over the Reign in the regular season.
The Thorns won the NWSL Shield this season for best regular-season record. They have won the NWSL championship twice, in the league’s inaugural season in 2013 and again in 2017.
The Thorns were without midfielder Lindsey Horan because of an eye injury. She released a statement just before the game that said she took a knock in practice on Saturday and lost vision for a few hours. The Thorns were also without midfielder Crystal Dunn, who announced this week that she is pregnant and due in the spring.
The Red Stars were without Mallory Pugh because of coronavirus protocol.
Chicago was hurt in the 23rd minute when attacker Kealia Watt injured her right knee and had to leave the game.
Watt’s replacement, Johnson, scored in the 37th minute to give the Red Stars the lead. Thorns goalkeeper Bella Bixby leaped but couldn’t deflect the shot from distance to the near post.
The Red Stars doubled the lead in the 59th minute on Woldmoe’s goal. Chicago goalkeeper Cassie Miller made six saves.
Bixby collapsed to the field after the loss in tears, and was helped off by her teammates. The game was the last for Thorns coach Mark Parsons, who is leaving to coach the Netherlands women’s national team full time.
The title game will be played next Saturday in Louisville, Kentucky.