There were three people left off the team -- Arike, Clark, Reese -- that would've had them winning by 10+ points. The players they brought that were mistakes were Gray, Taurasi, and Griner.
Taurasi is old and slow, so she doesn't bring anything on the offensive end that you don't already get from someone else AND she's a defensive liability. 0 minutes in the finals. Gray was coming off major injury and should not have been on the team. She couldn't play. Griner was similarly someone they chose to plant on the bench in the finals presumably because they thought she had limitations on offense.
If the five people you put on the floor was Clark (PG), Arike (SG), Stewart (SF), Reese (PF), Wilson (C) they would have throttled teams. But biggest issue was actually coaching. The first half vs France was some of the worst coached offensive basketball I've ever seen because they had no natural facilitator and no flow on offense. Often it was 4 people standing around watching one person go to the hoop off the dribble. If you don't have scripted or practiced motions... and you're asking people to play out of position... then often you're going to be hesitant or not on the same page with your teammates. That leads to hero ball and turnovers.