Not really, a chance to play against the best on the big stage is the best way for improvement. Doesn't matter if she wins or loses.
Winning isn't everything when you're young, look at Federer he had very poor senior results before he turned 18, but he played against Rafter and Aggasi when he was 17 (lost easily both times).
Look at Ash at Wimbledon for example.
She was in great form coming into the tournament. She chose to take a last minute MD WC. She lost Rnd 1.
If she had played qualies, she would have won her 3 matches definately and may have even carried this into a MD win. I know winning isn't everything but Donna right now is not at the level to take that risk.