I think Sherri has favored Mandy because she at least caught the ball and passed it well. Her rebounding has become almost non-existent, flat-footed much of the time. But, she seems to have regressed a bit in her decision-making, and Dee has had difficulty learning to catch passes, bricks for hands.
Slowly, Dee is improving that aspect of her game, and Mandy is becoming less useful in the team aspects of defense, blocking out, passing, etc. Mandy averaged 22-23 minutes in the first three games and is now down to about 17 in the last three.